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Mark `make_ascii_uppercase` and `make_ascii_lowercase` in `[u8]` and `str` as const. Relevant tracking issue: #130698 This PR extends #130697 and #130713 to the similar methods in byte slices (`[u8]`) and string slices (`str`). For the `str` methods, this simply requires adding the `const` specifier to the function signatures. The `[u8]` methods, however, require (at least a temporary) reimplementation due to the use of iterators and `for` loops.