Update ghcr.io/nginx/dependencies/nginx-ubi:ubi9 Docker digest to 55985e8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/nginx/dependencies/nginx-ubi	stage	digest	cd8693e -> 55985e8

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (f612e19) to head (02dd4cc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4347      +/-   ##
==========================================
- Coverage   86.10%   86.07%   -0.03%     
==========================================
  Files         132      132              
  Lines       14342    14342              
  Branches       35       35              
==========================================
- Hits        12349    12345       -4     
- Misses       1790     1792       +2     
- Partials      203      205       +2     

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