fix(build): fix GitHub CI workflow

[SuperITMan]

Upgrade NodeJS to v14 and npm to v8.

Add --yes option to npx usage in "test.sh".

Add "@types/node": "~14.14.31" devDependency

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NationalBankBelgium/code-style/blob/master/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ x] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

CI workflow is using deprecated actions and commands.

Tests are broken because of npx waiting for a user prompt + new version of @types/node breaks compatibility with TypeScript 3.x.

What is the new behavior?

Upgrade all actions + adapt command to use the new $GITHUB_ENV + fix test.sh + add "@types/node": "~14.14.31" devDependency

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information