Fix PostRelease Nightly Snapshot job

[Amar3tto]

Fixes #30505

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[gemini-code-assist]

Summary of Changes

Hello @Amar3tto, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue with the PostRelease Nightly Snapshot job by updating the Flink dependency. The change ensures that the job utilizes the correct and compatible Flink version, thereby maintaining the stability and functionality of the nightly snapshot process.

Highlights

• Flink Version Update: The PostRelease Nightly Snapshot job has been updated to use Flink version 1.20 instead of 1.19 for the runQuickstartJavaFlinkLocal task, addressing a reported issue.

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[github-actions]

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[Abacn]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.33%. Comparing base (1fbd111) to head (7fd15aa).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #36946   +/-   ##
=========================================
  Coverage     36.33%   36.33%           
  Complexity     1667     1667           
=========================================
  Files          1063     1063           
  Lines        166709   166709           
  Branches       1199     1199           
=========================================
  Hits          60579    60579           
  Misses       103954   103954           
  Partials       2176     2176           

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