chore: update dev dependencies and workflow

[crazy-max]

In prep to move this action to Node 16 as default runtime.

Node 12 has an end of life on April 30, 2022.

https://github.blog/changelog/2021-12-10-github-actions-github-hosted-runners-now-run-node-js-16-by-default/

[codecov]

Codecov Report

Merging #342 (06158fb) into master (ec57748) will decrease coverage by 3.84%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
- Coverage   70.76%   66.92%   -3.85%     
==========================================
  Files           4        4              
  Lines         130      130              
  Branches       23       23              
==========================================
- Hits           92       87       -5     
  Misses         25       25              
- Partials       13       18       +5     

Impacted Files	Coverage Δ
src/context.ts	88.88% <100.00%> (ø)
src/github.ts	80.00% <100.00%> (-6.67%)	⬇️
src/git.ts	70.83% <0.00%> (-4.17%)	⬇️
src/goreleaser.ts	56.71% <0.00%> (-2.99%)	⬇️

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