[3.13] gh-124984: Enhance `ssl` thread safety (GH-124993) (#125780)

Make SSL objects thread safe in Free Theaded build by
using critical sections.

(cherry picked from commit 4c53b2577531c77193430cdcd66ad6385fcda81f)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>