[DPE-9479] Test app channel and base/series (14/edge)

[dragomirp]

Update channel and base series after postgresql-test-app new base release.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.75%. Comparing base (fb76b3c) to head (85fb3e6).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1324   +/-   ##
=======================================
  Coverage   72.75%   72.75%           
=======================================
  Files          16       16           
  Lines        4162     4162           
  Branches      616      616           
=======================================
  Hits         3028     3028           
  Misses        905      905           
  Partials      229      229           

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