gh-126112: Fix test_os.TimerfdTests: use 10 ms resolution

[vstinner]

Use 10 ms for CLOCK_RES instead of 100 ms to tolerate slow buildbots.

• Issue: test_os.TimerfdTests is flaky #126112

[StanFromIreland]

LGTM

[miss-islington-app]

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

[bedevere-app]

GH-135704 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-135705 is a backport of this pull request to the 3.13 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable Refleaks 3.13 (tier-2) has failed when building commit 55a34a1.

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/#/builders/1512/builds/711) and take a look at the build logs.
4. Check if the failure is related to this commit (55a34a1) 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/#/builders/1512/builds/711

Failed tests:

• test_perf_profiler

Failed subtests:

• test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated - test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-aarch64.refleak/build/Lib/test/test_perf_profiler.py", line 393, in test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated
    self.assertEqual(stderr, "")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AssertionError: 'Warning:\nProcessed 490 events and lost 4[34 chars]\n\n' != ''
- Warning:
- Processed 490 events and lost 4 chunks!
- 
- Check IO/CPU overload!
- 


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-aarch64.refleak/build/Lib/test/test_perf_profiler.py", line 393, in test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated
    self.assertEqual(stderr, "")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AssertionError: 'Warning:\nProcessed 516 events and lost 1[34 chars]\n\n' != ''
- Warning:
- Processed 516 events and lost 1 chunks!
- 
- Check IO/CPU overload!
-