Remove locale.resetlocale() function in Python 3.13 #104783

Remove locale.getdefaultlocale() and locale.resetlocale() functions deprecated in Python 3.11: see issue #90817 for the rationale and the deprecation.

Linked PRs

• gh-104783: Remove locale.resetlocale() function #104784
• gh-104783: locale.getencoding() fallback uses FS encoding #105381
• gh-104783: locale.getlocale() calls sys.getfilesystemencoding() #105401