[3.13] gh-126112: Fix test_os.TimerfdTests: use 10 ms resolution (GH-135681) (#135705)

gh-126112: Fix test_os.TimerfdTests: use 10 ms resolution (GH-135681)

Use 10 ms for CLOCK_RES instead of 100 ms to tolerate slow buildbots.
(cherry picked from commit 5c25c884b93eb79f640c47d6dba20f11fdf0ade4)

Co-authored-by: Victor Stinner <vstinner@python.org>