Upgrade to AGP 4.2.0

[chao2zhang]

Verified in a test project that we are no longer mixing Kotlin 1.3 with 1.4. Buildscan: https://scans.gradle.com/s/3owvdxjm5onxo/

[codecov]

Codecov Report

Merging #3744 (3067b0a) into main (4ee28ac) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #3744   +/-   ##
=========================================
  Coverage     78.67%   78.67%           
  Complexity     2888     2888           
=========================================
  Files           473      473           
  Lines          9309     9309           
  Branches       1704     1704           
=========================================
  Hits           7324     7324           
  Misses         1080     1080           
  Partials        905      905           

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