Enable dependabot to update released branches

[jingxu97]

What would you like to be added:

Enable dependabot to update gomod for released branches

Why is this needed:

Similar to Kubernetes, we could have support for released branches, e.g., currently 1.30 and 1.29. Could we enable dependabot to update those release branches too?

[SergeyKanzhelev]

do you know the way?

these seems to indicate that it is not possible: dependabot/dependabot-core#2159 + dependabot/dependabot-core#2511

[saschagrunert]

Right now we don't have a maintenance plan for the release branches. It would trigger more work on our side to release after a modification semi-automatically happened to them. So, I'm in favor of not doing the suggested change event if it would be technically possible.

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