Fix oauth2 revoke functionality

[wolfv]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f20db64) 83.63% compared to head (bd6ab3d) 83.58%.
Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #665      +/-   ##
==========================================
- Coverage   83.63%   83.58%   -0.05%     
==========================================
  Files          79       79              
  Lines        6226     6226              
==========================================
- Hits         5207     5204       -3     
- Misses       1019     1022       +3     

Files	Coverage Δ
quetz/authentication/oauth2.py	84.12% <33.33%> (ø)

... and 1 file with indirect coverage changes

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