[Fixes #14144] Upgrade django allauth

[sijandh35]

Fixes #14144

Changes:

• Upgrade django-allauth to 65.16.0.
• Update the necessary code for the upgrade, including handling deprecated allauth settings warnings.
• Port the test from allauth.

Checklist

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[gemini-code-assist]

Code Review

This pull request upgrades django-allauth to version 65.16.0 and migrates deprecated authentication settings to the new ACCOUNT_SIGNUP_FIELDS and ACCOUNT_LOGIN_METHODS configuration, while maintaining backward compatibility. It also introduces new test utilities for OpenID Connect and updates documentation and serializers accordingly. Feedback points out a potential AttributeError in the test suite, a grammatical error in the documentation, and suggests improvements for request method checks and test assertions.

[gemini-code-assist]

The expression request.method in ("POST") is logically equivalent to request.method in "POST" because ("POST") is a string literal, not a tuple. This could lead to unexpected behavior if request.method were a substring of "POST" (e.g., "P"). It is safer and clearer to use equality or a proper tuple.

Suggested change

	if request.method in ("POST") and "email*" in getattr(settings, "ACCOUNT_SIGNUP_FIELDS", []) and not email:
	if request.method == "POST" and "email*" in getattr(settings, "ACCOUNT_SIGNUP_FIELDS", []) and not email:

[codecov]

Codecov Report

❌ Patch coverage is 68.20084% with 76 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.51%. Comparing base (94ca636) to head (0895dfa).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14145      +/-   ##
==========================================
- Coverage   74.62%   74.51%   -0.12%     
==========================================
  Files         958      959       +1     
  Lines       57891    58198     +307     
  Branches     7889     7946      +57     
==========================================
+ Hits        43202    43364     +162     
- Misses      12927    13053     +126     
- Partials     1762     1781      +19     

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