[3.11] gh-94823: Improve coverage in tokenizer.c:valid_utf8 (GH-94856) #96029
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When loading a source file from disk, there is a separate UTF-8 validator
distinct from the one in
unicode_decode_utf8
. This exercises that code pathwith the same set of invalid inputs as we use for testing the "other" UTF-8
decoder.
(cherry picked from commit f215d7c)
Co-authored-by: Michael Droettboom mdboom@gmail.com