gh-109592: test_eintr tolerates 20 ms when comparing timings

[vstinner]

• Issue: test_eintr: test_flock() fails with: 0.19043820584192872 not greater than or equal to 0.2 #109592

[vstinner]

Windows x86 failed with File "D:\a\cpython\cpython\Lib\test\test_concurrent_futures\test_shutdown.py", line 32 in test_interpreter_shutdown.

[miss-islington]

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[bedevere-app]

GH-110106 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-110107 is a backport of this pull request to the 3.11 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD 3.x has failed when building commit 9c73a9a.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1223/builds/275) and take a look at the build logs.
4. Check if the failure is related to this commit (9c73a9a) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1223/builds/275

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/threading.py", line 1066, in _bootstrap_inner
    self.run()
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/threading.py", line 1003, in run
    self._target(*self._args, **self._kwargs)
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/test/test_interpreters.py", line 484, in task
    interp = interpreters.create()
             ^^^^^^^^^^^^^^^^^^^^^
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/test/support/interpreters.py", line 25, in create
    id = _interpreters.create(isolated=isolated)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: interpreter creation failed
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Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 1354, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1316, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1256, in _find_spec
  File "<frozen importlib._bootstrap_external>", line 1538, in find_spec
  File "<frozen importlib._bootstrap_external>", line 1512, in _get_spec
  File "<frozen importlib._bootstrap_external>", line 1630, in find_spec
  File "<frozen importlib._bootstrap_external>", line 161, in _path_isfile
  File "<frozen importlib._bootstrap_external>", line 153, in _path_is_mode_type
  File "<frozen importlib._bootstrap_external>", line 147, in _path_stat
ValueError: embedded null byte