oidc: handle refresh token

[spacewander]

Fix #338
Signed-off-by: spacewander [email protected]

[codecov]

Codecov Report

Attention: Patch coverage is 87.77778% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 86.47%. Comparing base (c068121) to head (f3a2336).
Report is 5 commits behind head on main.

Files	Patch %	Lines
plugins/oidc/filter.go	89.02%	6 Missing and 3 partials ⚠️
plugins/oidc/config.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
- Coverage   86.50%   86.47%   -0.04%     
==========================================
  Files          72       72              
  Lines        3816     3874      +58     
==========================================
+ Hits         3301     3350      +49     
- Misses        374      379       +5     
- Partials      141      145       +4     

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