Update examples with keycloak 26.x

[nginx-bot]

Proposed changes

Update examples to use keycloak 26.4

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 53.38%. Comparing base (962d4ae) to head (ae4338d).
⚠️ Report is 27 commits behind head on release-5.2.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.2    #8365      +/-   ##
===============================================
- Coverage        53.43%   53.38%   -0.05%     
===============================================
  Files               91       91              
  Lines            22310    22306       -4     
===============================================
- Hits             11921    11909      -12     
- Misses            9886     9891       +5     
- Partials           503      506       +3     

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