stringprep and IDNA 2003 incorrectly handles some characters

[sethmlarson]

Linked PRs

• gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 #155293
• [3.15] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) #156017
• [3.14] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) #156020
• [3.13] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) (GH-156020) #156922
• [3.12] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) (GH-156020) #156930
• [3.11] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) (GH-156020) #156931
• [3.10] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) (GH-156020) #156932