Patch copied from Gentoo removing obsolete Python2 code.

--- a/chai/chai.py
+++ b/chai/chai.py
@@ -62,11 +62,6 @@
             try:
                 func(self, *args, **kwargs)
             except UnexpectedCall as e:
-                # if this is not python3, use python2 syntax
-                if not hasattr(e, '__traceback__'):
-                    from .python2 import reraise
-                    reraise(
-                        AssertionError, '\n\n' + str(e), sys.exc_info()[-1])
                 exc = AssertionError('\n\n' + str(e))
                 setattr(exc, '__traceback__', sys.exc_info()[-1])
                 raise exc
--- a/chai/python2.py
+++ b/chai/python2.py
@@ -1,3 +0,0 @@
-
-def reraise(exc, msg, traceback):
-    raise exc, msg, traceback
--- a/chai.egg-info/SOURCES.txt
+++ b/chai.egg-info/SOURCES.txt
@@ -10,7 +10,6 @@
 chai/exception.py
 chai/expectation.py
 chai/mock.py
-chai/python2.py
 chai/spy.py
 chai/stub.py
 chai.egg-info/PKG-INFO
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<div class='path'>path: <a href='/guix/log/?id=785b6590186759d8a9a9d231e7d8ff958707a808'>root</a>/<a href='/guix/log/.patman?id=785b6590186759d8a9a9d231e7d8ff958707a808'>.patman</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/.patman?id=785b6590186759d8a9a9d231e7d8ff958707a808&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-10-22 16:09:04 -0400'>2023-10-22</span></td><td><a href='/guix/commit/.patman?id=f44fa21c3ec1d9bf1b9da009e1c795942bf654eb'>gnu: patman: Apply patch for new Change-Id setting.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-01 12:39:11 -0400'>2023-05-01</span></td><td><a href='/guix/commit/.patman?id=f21007ce4aceeacf5bbfc7cd45d526073141f194'>.patman: Remove get_maintainer_script option.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-02-25 23:10:59 -0500'>2023-02-25</span></td><td><a href='/guix/commit/.patman?id=cb0d8100b288b5b0d130820207db17764b7d2140'>.patman: Ignore bad tags.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>