Upgrade docker base images alpine:3.19.0 & golang:1.21

[ghost]

Fixes CVE-2023-5363 by updating the base image in Dockerfile.

The other vulnerability (opentelemetry go dependency) results from the k8s.io/* dependencies which need a new release.

Checklist

• added release notes to Unreleased section in CHANGELOG.md

References

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request

[codeclimate]

Code Climate has analyzed commit 33c6903 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 55.8% (0.0% change).

View more on Code Climate.

[LittleFox94]

If we can't patch "the other vulnerability", please try to gauge how critical that is for us and add an override (and comment with your findings) in .trivyignore if we can safely ignore it for now - this way the CI is green