feat: allow to PR homebrew taps

[caarlos0]

closes #3485

also fixed a bug in file creation for github: it was always searching for the file in the default branch

also, we don't need to create the file first, update does both create and update.

TODO: implement the for krew, scoop, etc...

[codecov]

Codecov Report

Merging #3903 (30c1438) into main (9dcc63c) will increase coverage by 0.40%.
The diff coverage is 72.82%.

❗ Current head 30c1438 differs from pull request most recent head dcdbb27. Consider uploading reports for the commit dcdbb27 to get more accurate results

@@            Coverage Diff             @@
##             main    #3903      +/-   ##
==========================================
+ Coverage   83.44%   83.84%   +0.40%     
==========================================
  Files         123      123              
  Lines       10660    10702      +42     
==========================================
+ Hits         8895     8973      +78     
+ Misses       1433     1389      -44     
- Partials      332      340       +8     

Impacted Files	Coverage Δ
pkg/config/config.go	95.21% <ø> (ø)
internal/pipe/brew/brew.go	82.51% <57.14%> (-1.25%)	⬇️
internal/client/github.go	54.05% <68.33%> (+15.45%)	⬆️
internal/client/client.go	86.48% <100.00%> (ø)
internal/client/config.go	100.00% <100.00%> (ø)
internal/client/gitea.go	86.66% <100.00%> (ø)
internal/client/gitlab.go	80.24% <100.00%> (ø)
internal/client/mock.go	91.22% <100.00%> (+3.72%)	⬆️
internal/pipe/changelog/changelog.go	92.13% <100.00%> (ø)

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