chore: remove old VERSION file

[erisu]

Motivation, Context & Description

VERSION file is no longer referenced and should no longer be used.
Version is stored and should be read from package.json

This PR removes the VERSION file.

Testing

• npm t
• Various Cordova CLI commands.

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

Merging #1273 (7893b39) into master (3e870e3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1273   +/-   ##
=======================================
  Coverage   73.26%   73.26%           
=======================================
  Files          21       21           
  Lines        1646     1646           
=======================================
  Hits         1206     1206           
  Misses        440      440           

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