[release/7.0][mono] Use unsigned char when computing UTF8 string hashes#83302

lambdageek merged 2 commits intodotnet:release/7.0-stagingdotnet/runtime:release/7.0-stagingfrom

lambdageek:fix-gh-82187-net7lambdageek/runtime:fix-gh-82187-net7Copy head branch name to clipboard