Upgrade to Gradle 7.3

[chao2zhang]

This PR merely bumps the version. We can leverage more features enabled in 7.3 later.

Release notes:
https://docs.gradle.org/7.3/release-notes.html

[codecov]

Codecov Report

Merging #4254 (d9c157f) into main (d1892dc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #4254   +/-   ##
=========================================
  Coverage     84.32%   84.32%           
  Complexity     3243     3243           
=========================================
  Files           470      470           
  Lines         10223    10223           
  Branches       1787     1787           
=========================================
  Hits           8621     8621           
  Misses          663      663           
  Partials        939      939           

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