Postpone removal version for locale.getdefaultlocale() #111187

locale.getdefaultlocale() was deprecated in Python 3.11 and originally planned for removal in 3.13 (gh-90817).

It's now time for 3.13 changes, but we decided to postpone its removal to 3.15 as it's still used by many projects.

Re:

• gh-104783: Remove locale.resetlocale() function #104784 (comment)
• Remove locale.resetlocale() function in Python 3.13 #104783 (comment)

Linked PRs

• gh-111187: Postpone removal version for locale.getdefaultlocale() to 3.15 #111188
• [3.12] gh-111187: Postpone removal version for locale.getdefaultlocale() to 3.15 (GH-111188) #111323
• [3.11] gh-111187: Postpone removal version for locale.getdefaultlocale() to 3.15 (GH-111188) #111326