Update OIDC files with reference implementation

[vepatel]

Proposed changes

• This PR updates oidc files using reference implementation
• commits included are nginxinc/nginx-openid-connect@1f5053b, nginxinc/nginx-openid-connect@66c4eaa, nginxinc/nginx-openid-connect@1da0cc1 and nginxinc/nginx-openid-connect@f7e8726

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.32%. Comparing base (9ed8ca2) to head (32fedb4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7722      +/-   ##
==========================================
+ Coverage   52.30%   52.32%   +0.01%     
==========================================
  Files          89       89              
  Lines       21363    21363              
==========================================
+ Hits        11174    11178       +4     
+ Misses       9721     9719       -2     
+ Partials      468      466       -2     

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