[3.13] gh-117657: Avoid race in `PAUSE_ADAPTIVE_COUNTER` in free-threaded build (GH-122190) (#122475)

The adaptive counter doesn't do anything currently in the free-threaded
build and TSan reports a data race due to concurrent modifications to
the counter.
(cherry picked from commit 2b163aa9e796b312bb0549d49145d26e4904768e)

Co-authored-by: Sam Gross <colesbury@gmail.com>