override Dir#mktmpdir to force-sanitize prefix_suffix
on windows the allowed characters for directories is stricter than on posix and as a result self.class may not be used as prefix verbatim. as a safe guard we now prepend a sanitizer to Dir#mktmpdir so that only valid characters can be used as prefix_suffix and we wont accidently create invalid paths in the future BUG: 393011
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e3c4f6ca
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