Use same golang version in go.mod as in bosh

[jorbaum]

The CI job does not seem to automatically bump this version.

Description

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist:

• This PR is being made against the main branch, or relevant version branch
• I have made corresponding changes to the documentation
• I have added testing for my changes

[chombium]

We are always bumping the Go version manually. I'm not sure if something has changed and now the tas bot updates Go in the bosh packaging, but doesn't update the version in the code.

@weili-broadcom, @jorbaum We should discuss if we continue bumping the version manually or want to automate something in order to keep both version in sync.

[jorbaum]

@weili-broadcom, @jorbaum We should discuss if we continue bumping the version manually or want to automate something in order to keep both version in sync.

It would be interesting to know why the tas-runtime-bot does not bump golang version in src/. Sounds to me like it would be a good thing to automate in general.