This patches add compatibility for the forthcoming RobotFramework 5.

Taken from: https://github.com/robotframework/SSHLibrary/pull/403.
diff --git a/src/SSHLibrary/pythonforward.py b/src/SSHLibrary/pythonforward.py
index 8b85997b7..607985cf4 100644
--- a/src/SSHLibrary/pythonforward.py
+++ b/src/SSHLibrary/pythonforward.py
@@ -1,9 +1,9 @@
 import select
 import socket
 import threading
-from robot.utils import platform
+from robot.utils import PY2, WINDOWS
 from .logger import logger
-if platform.PY2 and platform.WINDOWS:
+if PY2 and WINDOWS:
     import win_inet_pton
 try:
     import SocketServer
292dc799c36e0c613a53f0e'/><select name='h' onchange='this.form.submit();'>
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<div class='path'>path: <a href='/guix/log/?id=13cdd11914872ea44292dc799c36e0c613a53f0e'>root</a>/<a href='/guix/log/tests?id=13cdd11914872ea44292dc799c36e0c613a53f0e'>tests</a>/<a href='/guix/log/tests/substitute.scm?id=13cdd11914872ea44292dc799c36e0c613a53f0e'>substitute.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/substitute.scm?id=13cdd11914872ea44292dc799c36e0c613a53f0e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-12-04 22:26:36 +0100'>2023-12-04</span></td><td><a href='/guix/commit/tests/substitute.scm?id=06b9c1260c72935806957bf302c40c1db6101a63'>substitute: Do not exit when failing to find a nar.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-06-08 22:54:58 +0200'>2023-06-08</span></td><td><a href='/guix/commit/tests/substitute.scm?id=885d524f79aa4bbfac5dfebf285e1e248184ee70'>substitute: Gracefully retry after failed partial downloads.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-30 00:15:29 +0200'>2023-05-30</span></td><td><a href='/guix/commit/tests/substitute.scm?id=8af9a2aa5fa2fa5b00234c1cbe12e9aff60888a0'>substitute: If a server's nar URL is 404, try the next one(s).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-09-28 22:28:27 +0200'>2022-09-28</span></td><td><a href='/guix/commit/tests/substitute.scm?id=8bd4126917f59f4af9a4323c3d5699201862dca2'>substitute: Retry downloading when a nar is unavailable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-09-24 17:59:04 +0200'>2022-09-24</span></td><td><a href='/guix/commit/tests/substitute.scm?id=08023bcab35faafcf3e9c77babe910d9ece240d2'>substitute: Test behavior with unroutable substitute server addresses.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-02-14 11:23:56 +0100'>2022-02-14</span></td><td><a href='/guix/commit/tests/substitute.scm?id=6adce1538d2df6fa2d68abc13ae94e2fa826d124'>publish: Do not sign the URL/Compression/FileSize narinfo fields.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-04-09 17:46:38 +0200'>2021-04-09</span></td><td><a href='/guix/commit/tests/substitute.scm?id=2d73086262e1fb33cd0f0f16f74a495fe06b38aa'>daemon: 'guix substitute' replies on FD 4.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-01-16 11:51:03 +0000'>2021-01-16</span></td><td><a href='/guix/commit/tests/substitute.scm?id=681af17460fa34916ac40589cccdcca7222249af'>guix: Move narinfo code from substitute script to module.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2020-12-19 23:25:01 +0100'>2020-12-19</span></td><td><a href='/guix/commit/tests/substitute.scm?id=77a1efed9e12ce0e2c470d7b0601ae70c72b010b'>tests: Check the mtime and permissions of substituted items.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-19 23:25:00 +0100'>2020-12-19</span></td><td><a href='/guix/commit/tests/substitute.scm?id=9dfa20a22ae0be3d3b01a7b3d422af97428c627e'>daemon: Let 'guix substitute' perform hash checks.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-08 22:30:08 +0100'>2020-12-08</span></td><td><a href='/guix/commit/tests/substitute.scm?id=711df9ef3c04a0e0d7e844bed4c6b260ea1f65c1'>daemon: Run 'guix substitute --substitute' as an agent.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-08 22:30:08 +0100'>2020-12-08</span></td><td><a href='/guix/commit/tests/substitute.scm?id=79c6614f58a57b985daf8940766319e440311db0'>daemon: Use 'Agent' to spawn 'guix substitute --query'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-08-24 13:35:24 +0200'>2020-08-24</span></td><td><a href='/guix/commit/tests/substitute.scm?id=4c0c65acfade63ce0549115d19db4b639c1e9992'>Use "guile-zlib" and "guile-lzlib" instead of (guix config).</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-11-27 00:03:03 +0100'>2019-11-27</span></td><td><a href='/guix/commit/tests/substitute.scm?id=434138e2f26b28bb5cc83e62327aae8ed0902475'>substitute: Make '%allow-unauthenticated-substitutes?' public.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-02 22:01:57 +0200'>2019-06-02</span></td><td><a href='/guix/commit/tests/substitute.scm?id=b90ae065b5a5fab4ed475bf2faa3a84476389a02'>substitute: Select the best compression methods.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-14 00:02:59 +0100'>2018-12-14</span></td><td><a href='/guix/commit/tests/substitute.scm?id=60b04024f8823192b74c1ed5b14f318049865ac7'>substitute: Ignore irrelevant narinfo signatures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-04 17:25:11 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/substitute.scm?id=ca719424455465fca4b872c371daf2a46de88b33'>Switch to Guile-Gcrypt.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>