gh-144763: Don't detach the GIL in tracemalloc

[vstinner]

tracemalloc no longer detachs the GIL to acquire its internal lock.

• Issue: Crash in _io_TextIOWrapper_write_impl when running tracemalloc.clear_traces in threads #144763

[vstinner]

This change basically reverts commit 01157e0 (PR gh-139449) which fixed another deadlock on tracemalloc.stop() :-) See issue gh-139116.

cc @ZeroIntensity @encukou

[vstinner]

This change basically reverts commit 01157e0 (PR #139449) which fixed another deadlock on tracemalloc.stop() :-) See issue #139116.

I pushed a change to avoid the deadlock on tracemalloc.stop(): don't call PyRefTracer_SetTracer() while holding TABLES_LOCK().