[3.12] gh-127208: Reject null character in _imp.create_dynamic() (#127400) #127419
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_imp.create_dynamic() now rejects embedded null characters in the path and in the module name.
Backport also the _PyUnicode_AsUTF8NoNUL() function.
(cherry picked from commit b14fdad)
ExtensionFileLoader.load_module
aborts when initialized with a path containing null-bytes #127208