Revert to node v8

[myty]

Fixes #213 Broken Build

• [x] Related GitHub issue(s) linked in PR description
• [x] Destination branch merged, built and tested with your changes
• [x] Code formatted and follows best practices and patterns
• [x] Code builds cleanly (no additional warnings or errors)
• [x] Manually tested
• [x] Automated tests are passing
• [x] No decreases in automated test coverage
• [x] Documentation updated (readme, docs, comments, etc.)
• [x] Localization: No hard-coded error messages in code files (minimally in string constants)

[codecov[bot]]

Codecov Report

Merging #214 (0f6f035) into main (08ae3ea) will increase coverage by 0.44%. The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
+ Coverage   74.46%   74.91%   +0.44%     
==========================================
  Files          45       45              
  Lines        1692     1722      +30     
  Branches      289      294       +5     
==========================================
+ Hits         1260     1290      +30     
  Misses        424      424              
  Partials        8        8              

Impacted Files	Coverage Δ
src/modules/git.ts	74.57% <95.83%> (+16.24%)	:arrow_up:
src/modules/dotnet-test.ts	46.26% <100.00%> (+2.96%)	:arrow_up:

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