fix: update node version to v20 for release and testing workflow

[mesaugat]

Updates

• Update release workflow as it is failing because new version of semantic-release requires node v20 or above
• Update testing workflow to use node v20
• Use recent version of GitHub actions for actions/checkout and actions/setup-node
• Bump probot to version ^13.0.2 as some tests were failing (especially smoke and scheduler test) in the previous version
• Bump jest and nock to latest versions --> nock was not mocking http requests in a few cases, don't know the exact reason but upgrading the version did work 🤷
• Cleanup nock stuff after scheduler test is done

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.91%. Comparing base (375def2) to head (0897130).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #738   +/-   ##
=======================================
  Coverage   92.91%   92.91%           
=======================================
  Files         110      110           
  Lines        2878     2878           
  Branches      578      578           
=======================================
  Hits         2674     2674           
  Misses        185      185           
  Partials       19       19           

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[github-actions]

🎉 This PR is included in version 2.17.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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