refactor: use built-in getExecOutput

[crazy-max]

No description provided.

[codecov]

Codecov Report

Merging #292 (bc9440a) into master (b2263bd) will decrease coverage by 0.53%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
- Coverage   86.40%   85.86%   -0.54%     
==========================================
  Files           5        4       -1     
  Lines         103       92      -11     
  Branches       18       17       -1     
==========================================
- Hits           89       79      -10     
  Misses          6        6              
+ Partials        8        7       -1     

Impacted Files	Coverage Δ
src/git.ts	75.00% <80.00%> (ø)
src/installer.ts	94.11% <100.00%> (-0.17%)	⬇️

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