add branch selection for github-push-action

[duviful]

As i found myself in the need to bump different version on different branches (main/develop), i thought about adjusting you action.yml to allow specifying the branch.

Thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.05%. Comparing base (075d0da) to head (4ecc07c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   94.05%   94.05%           
=======================================
  Files          26       26           
  Lines        1716     1716           
  Branches      232      232           
=======================================
  Hits         1614     1614           
  Misses         75       75           
  Partials       27       27           

Flag	Coverage Δ
python-3.10	94.05% <ø> (ø)
python-3.11	94.05% <ø> (ø)
python-3.8	93.91% <ø> (ø)
python-3.9	93.97% <ø> (ø)

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