[release-20.0] Bump to v20.0.3-SNAPSHOT after the v20.0.2 release

[shlomi-noach]

Includes the changes required to go back into dev mode (v20.0.3-SNAPSHOT) after the release of v20.0.2.

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.69%. Comparing base (2592c59) to head (7023d5c).
Report is 1 commits behind head on release-20.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-20.0   #16756      +/-   ##
================================================
+ Coverage         68.67%   68.69%   +0.02%     
================================================
  Files              1541     1541              
  Lines            197937   197937              
================================================
+ Hits             135925   135965      +40     
+ Misses            62012    61972      -40     

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[shlomi-noach]

Query Serving (Queries) Next Release - Upgrade Downgrade Testing fails pretty consistently

[shlomi-noach]

oh, it's green now!