Cleanup: generics replace deprecated sets.String.

[bendory]

Changes

There are no expected functional changes in this PR.

In the k8s.io/apimachinery/pkg/util/sets package, the specified Set types like sets.String have been deprecated in favor of generics like sets.Set[string]. This PR changes to the generic type across our repository.

See: https://pkg.go.dev/k8s.io/apimachinery/pkg/util/sets

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

/kind cleanup

Release Notes

ACTION REQUIRED: users who build against Tekton Chains may need to adjust their code to use
generic `sets.Set[string]` types in place of `sets.String` types. See https://pkg.go.dev/k8s.io/apimachinery/pkg/util/sets for details.

[lcarva]

Thanks for this!

Just a minor comment for consideration.

[tekton-robot]

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This pull-request has been approved by: lcarva

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[lcarva]

/lgtm