Upgrade to node v14

[brandongregoryscott]

Resolves #162 Upgrade node requirement to v14 LTS

Update node engine requirement to v14+, update failing integration tests and tweak them to be more .NET 5 compatible

• [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
• [-] Documentation updated (readme, docs, comments, etc.)
• [-] Localization: No hard-coded error messages in code files (minimally in string constants)

[codecov[bot]]

Codecov Report

Merging #218 (a8456ff) into main (bf605a6) will increase coverage by 1.63%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
+ Coverage   74.91%   76.54%   +1.63%     
==========================================
  Files          45       35      -10     
  Lines        1722     1586     -136     
  Branches      294      247      -47     
==========================================
- Hits         1290     1214      -76     
+ Misses        424      371      -53     
+ Partials        8        1       -7     

Impacted Files	Coverage Δ
src/modules/github.ts	71.81% <0.00%> (ø)
src/modules/prompt.ts	54.54% <0.00%> (ø)
src/modules/nuget-upgrade.ts	70.00% <0.00%> (ø)
src/tests/factories/command-definition-factory.ts
src/tests/factories/issue-factory.ts
src/tests/factories/create-issue-dto-factory.ts
src/tests/factories/repository-factory.ts
...tests/factories/webpack-restore-options-factory.ts
src/tests/factories/factory-type.ts
src/tests/factories/index.ts
... and 2 more

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