[3.11] [3.12] gh-109413: libregrtest: enable mypy's --strict-optional
check on most files (GH-112586) (GH-112602)
#112603
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gh-109413: libregrtest: enable mypy's
--strict-optional
check on most files (GH-112586)(cherry picked from commit 36dbebe)
Co-authored-by: Alex Waygood Alex.Waygood@Gmail.com
Co-authored-by: Victor Stinner vstinner@python.org