Fix: dont allow allauth redirects to any host

[shamoon]

Proposed change

This is a little tricky. If we change the default ALLOWED_HOSTS I think we will break a lot of installs. This should handle the issue and I think should be OK because it only affects regular login (not social)

Closes #5780

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d664fa) 96.68% compared to head (f51e000) 96.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #5783   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files         405      405           
  Lines       16158    16167    +9     
  Branches     1172     1244   +72     
=======================================
+ Hits        15622    15631    +9     
  Misses        536      536           

Flag	Coverage Δ
backend	95.59% <100.00%> (+<0.01%)	⬆️
frontend	97.99% <ø> (ø)

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[shamoon]

Thanks for help with testing stumpy!

[github-actions]

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