Update go to 1.23 and plumbing vendoring

[afrittoli]

Changes

The vendored version of tektoncd/plumbing is from 2023.
Updating plumbing brings in an update of golang as well to 1.23.

go get github.com/tektoncd/plumbing@f515628dffea46d3a0556b52e19119ba21e9e4ad
go mod tidy
go mod vendor

/kind misc

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

Release Notes

NONE

[tekton-robot]

@afrittoli: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-chains-integration-tests	fa4c1df	link	true	/test pull-tekton-chains-integration-tests

Full PR test history. Your PR dashboard.

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[vdemeester]

/approve

@afrittoli you might need to rebase.

[lcarva]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcarva, vdemeester

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