[3.9] bpo-41084: Fix test_fstring failure when using the old parser (GH-21212)

bpo-41048: mimetypes should read the rule file using UTF-8, not the locale encoding (GH-20998)

bpo-41048: mimetypes should read the rule file using UTF-8, not the locale encoding (GH-20998)

bpo-41123: Remove PyLong_FromUnicode() (GH-21204)

bpo-41123: Remove PyUnicode_GetMax() (GH-21192)