This ensures we bump the code for 1.20.
It updates the testing to ensure kured works on a 1.20 cluster,
removes the testing on 1.17 (as it is now deprecated).
Libraries remain on 1.19, to avoid breaking 1.18 clusters.

Without this patch, the PR jobs are broken and no jobs are running.
This was a recently introduced typo in the last refactor of the
PR jobs.

This should fix it, and make the PR test working again.

Without this, golang version used is the golang version decided
by github.

This is a problem, as it might shift over time, without our control.

This fixes it by getting the golang version from the go.mod.

Bumps [nick-invision/retry](https://github.com/nick-invision/retry) from v1 to v2.2.0.
- [Release notes](https://github.com/nick-invision/retry/releases)
- [Changelog](https://github.com/nick-invision/retry/blob/master/.releaserc.js)
- [Commits](https://github.com/nick-invision/retry/compare/v1...fb3bca3fb54f6488d7508c8d1eeb64b94efd5a93

)

Signed-off-by: dependabot[bot] <support@github.com>

- Made all the file extensions ".yaml"
- Regrouped actions together to make it easy to see when they
  are useful: on-pr is useful at every PR, on-tag when we are
  ready to tag next image, on-pr-chart when we have a PR to
  modify the chart with the published image, on-release when
  we have released and need to publish the final helm chart
- Regrouped periodic jobs together, to deal with stale prs/issues
  and ensuring that our helm chart always works.