Replaced set-env instruction in Github Actions with safer one

[vania-pooh]

No description provided.

[codecov]

Codecov Report

Merging #58 (f784dea) into master (dbe8a7d) will decrease coverage by 3.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   54.89%   51.86%   -3.03%     
==========================================
  Files           3        3              
  Lines         235      214      -21     
==========================================
- Hits          129      111      -18     
+ Misses         92       89       -3     
  Partials       14       14              

Flag	Coverage Δ
go	51.86% <ø> (-3.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
watch.go	16.66% <0.00%> (-11.91%)	⬇️
main.go	48.48% <0.00%> (-4.15%)	⬇️
ggr-ui.go	54.92% <0.00%> (-2.31%)	⬇️

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