[3.13] gh-127165: Disallow embedded NULL characters in `_interpreters` (GH-127199) (#127463)

gh-127165: Disallow embedded NULL characters in `_interpreters` (GH-127199)
(cherry picked from commit 46bfd26fb294a8769ef6d0c056ee6c9df022a037)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>