PEP 743: Rewrite to hide (soft-)deprecated API (GH-3869)

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

Author: encukou

.github/CODEOWNERS

@@ -621,7 +621,7 @@ peps/pep-0738.rst  @encukou
 peps/pep-0740.rst  @dstufft
 peps/pep-0741.rst  @vstinner
 peps/pep-0742.rst  @JelleZijlstra
-peps/pep-0743.rst  @vstinner
+peps/pep-0743.rst  @vstinner @encukou
 peps/pep-0744.rst  @brandtbucher
 peps/pep-0745.rst  @hugovk
 peps/pep-0746.rst  @JelleZijlstra