Fix #3076

[9p4]

Details

• Does this resolve an issue?
  Resolves [Gitea] Authentication sources with non-lowercase names do not work #3076
  Resolves Jenkins login broken due to lower cased redirect URI #3083

Additional

Ideally there would be a test to check if an uppercased redirect URI would work but that would require for the OIDC testing Docker image to be changed, since the URL is hardcoded.

[codecov]

Codecov Report

Merging #3114 (b3c131b) into main (2298eb1) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3114      +/-   ##
==========================================
+ Coverage   92.02%   92.03%   +0.01%     
==========================================
  Files         466      466              
  Lines       20998    20998              
==========================================
+ Hits        19322    19324       +2     
+ Misses       1676     1674       -2     

Impacted Files	Coverage Δ
authentik/providers/oauth2/views/token.py	83.27% <ø> (ø)
authentik/core/api/sources.py	83.55% <0.00%> (+2.54%)	⬆️

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[9p4]

BeryJu/oidc-test-client#20

[BeryJu]

@9p4 Ty for the PR, I think this is much easier tested with a unittest than with an e2e test, but I'll add that option to the oidc-test-client regardless