Remove Go dependency from homebrew

[cuminandpaprika]

This commit removes the Go dependency from the homebrew goreleaser config. Most of the current users of Sysl are Go developers and we the current homebrew formula interferes with the local installation of Go, and can cause unintended upgrades to the Go version.

Checklist:

• Added related tests
• Made corresponding changes to the documentation

[codecov]

Codecov Report

Merging #938 into master will increase coverage by 0.67%.
The diff coverage is 83.77%.

@@            Coverage Diff             @@
##           master     #938      +/-   ##
==========================================
+ Coverage   83.35%   84.03%   +0.67%     
==========================================
  Files          73       74       +1     
  Lines       10609    10301     -308     
==========================================
- Hits         8843     8656     -187     
+ Misses       1432     1335      -97     
+ Partials      334      310      -24     

Impacted Files	Coverage Δ
pkg/pbutil/output.go	76.00% <ø> (-0.48%)	⬇️
pkg/parse/listener_impl.go	89.50% <54.54%> (-0.01%)	⬇️
pkg/importer/importer.go	63.15% <63.15%> (ø)
pkg/mod/gomod.go	73.68% <66.66%> (+1.27%)	⬆️
pkg/parse/parse.go	83.47% <69.56%> (-0.50%)	⬇️
pkg/mod/module.go	66.66% <72.72%> (+0.95%)	⬆️
pkg/importer/formats.go	77.27% <77.27%> (ø)
pkg/importer/openapi.go	81.73% <80.71%> (-7.72%)	⬇️
pkg/importer/swagger.go	81.48% <88.88%> (+1.88%)	⬆️
pkg/importer/xsd.go	91.01% <95.23%> (+0.64%)	⬆️
... and 13 more