Clean the local maven repo before publishing to it

[mhammond]

Fixes #4738 - see also https://github.com/mozilla-mobile/android-components/pull/11414

[codecov-commenter]

Codecov Report

Merging #4739 (0b16e22) into main (ab89c50) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4739   +/-   ##
=======================================
  Coverage   81.33%   81.33%           
=======================================
  Files          59       59           
  Lines        5739     5739           
=======================================
  Hits         4668     4668           
  Misses       1071     1071           

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