✨ feat: use specified go version for docker build

[simonostendorf]

What this PR does / why we need it:

This PR uses the specified GO_VERSION from the makefile to build the docker image. Currently the hardcoded patch release .0 is used, but I think using the specified version from the Makefile and not an old version that is missing some patches is a good idea.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

none

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

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[k8s-ci-robot]

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[simonostendorf]

/unhold

[EmilienM]

/ok-to-test