chore(deps): update quay.io/keycloak/keycloak docker tag to v26

[renovate]

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This PR contains the following updates:

Package	Update	Change
quay.io/keycloak/keycloak	major	24.0.5 -> 26.4.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.44%. Comparing base (a3e6677) to head (cdfeabc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2671      +/-   ##
==========================================
- Coverage   95.45%   95.44%   -0.01%     
==========================================
  Files         392      392              
  Lines       24776    24776              
  Branches      702      700       -2     
==========================================
- Hits        23649    23647       -2     
  Misses        536      536              
- Partials      591      593       +2     

see 1 file with indirect coverage changes

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