Increase thread timeout to reduce flakiness.

Taken from upstream:
https://github.com/xbmc/xbmc/commit/574b0182d8b641fd24029f372ebdcccc897123e2

diff --git a/xbmc/threads/test/TestEvent.cpp b/xbmc/threads/test/TestEvent.cpp
index 42fb8c2fc609..40e644c0ed3c 100644
--- a/xbmc/threads/test/TestEvent.cpp
+++ b/xbmc/threads/test/TestEvent.cpp
@@ -484,7 +484,7 @@ TEST(TestEvent, GroupTimedWait)
   EXPECT_TRUE(w3.result == NULL);
 
   // this should end given the wait is for only 50 millis
-  EXPECT_TRUE(waitThread3.timed_join(MILLIS(100)));
+  EXPECT_TRUE(waitThread3.timed_join(MILLIS(200)));
 
   EXPECT_TRUE(!w3.waiting);
   EXPECT_TRUE(w3.result == NULL);
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<tr><th>author</th><td>Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;</td><td class='right'>2021-09-24 17:48:17 +0200</td></tr>
<tr><th>committer</th><td>Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;</td><td class='right'>2021-09-24 17:48:47 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/Makefile.am?id=5f60c6dc85efd347bb79f4606c4a73fab99eaadd'>5f60c6dc85efd347bb79f4606c4a73fab99eaadd</a> (<a href='/guix/patch/Makefile.am?id=5f60c6dc85efd347bb79f4606c4a73fab99eaadd'>patch</a>)</td></tr>
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<div class='commit-subject'>gnu: pan: Update to 0.147.</div><div class='commit-msg'>* gnu/packages/mail.scm (pan): Update to 0.147.
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