[3.11] [3.12] gh-109413: libregrtest: enable mypy's --strict-optional check on most files (GH-112586) (GH-112602) - #112603

[3.11] [3.12] gh-109413: libregrtest: enable mypy's --strict-optional check on most files (GH-112586) (GH-112602)#112603

AlexWaygood merged 1 commit into

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