Update Go version to 1.25.11 to address GO-2026-5038 / CVE-2026-42504

[MaxWinterstein]

What this PR does / why we need it:

Updates the Go version to 1.25.11 to address vulnerability GO-2026-5038 aka. CVE-2026-42504 .

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?

Additional Notes for your reviewer:

Review Checklist:

• Follows the developer guidelines
• Relevant tests are added or updated
• Relevant docs in this repo added or updated
• Relevant carvel.dev docs added or updated in a separate PR and there's
  a link to that PR
• Code is at least as readable and maintainable as it was before this
  change

Additional documentation e.g., Proposal, usage docs, etc.:

[joaopapereira]

@praveenrewar I tagged you because looks like the problem of the missing image is back, did yll not create a github action to create it?

[praveenrewar]

@praveenrewar I tagged you because looks like the problem of the missing image is back, did yll not create a github action to create it?

I thought we had a github action, but I tried looking for it and could not find anything, and now I think it was just pushed manually a few times before. We should switch to a github action though.