Upgrade github actions where applicable

[shamil]

No description provided.

[codecov]

Codecov Report

Merging #22 (1988f4c) into master (0df1922) will increase coverage by 6.59%.
Report is 9 commits behind head on master.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   62.92%   69.51%   +6.59%     
==========================================
  Files           5        6       +1     
  Lines         553      666     +113     
==========================================
+ Hits          348      463     +115     
+ Misses        178      175       -3     
- Partials       27       28       +1     

Files Changed	Coverage Δ
pkg/backend/type/gce/gce.go	20.21% <0.00%> (+0.62%)	⬆️
pkg/backend/type/gce/url_parser.go	85.71% <ø> (ø)
pkg/scaler/scaler.go	76.37% <79.62%> (+4.09%)	⬆️
pkg/scaler/client/client.go	90.58% <85.36%> (ø)

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