chore: update test matrix for Tekton Pipelines v1.16.0

[vdemeester]

Changes

Update the CI test matrix to use the latest Tekton Pipelines releases:

• latest: v1.16.0
• lts-latest: v1.15.0
• lts-latest-minus-one: v1.12.0
• lts-latest-minus-two: v1.9.0
• lts-latest-minus-three: v1.6.0

This update follows the release of Tekton Pipelines v1.16.0 "Manx WALL-E", and
catches up the LTS chain (previous values had drifted across a few release
cycles: latest was still v1.13.0, lts-latest-minus-two/three were EOL
v1.3.0/v1.0.0 instead of the current v1.9.0/v1.6.0).

/kind misc

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Follows the authoring recommendations
• Includes docs (if user facing)
• Includes tests (for new tasks or changed functionality)
  • See the end-to-end testing documentation for guidance and CI details.
• Meets the Tekton contributor standards (including functionality, content, code)
• Commit messages follow commit message best practices
• Has a kind label. You can add one by adding a comment on this PR that
  contains /kind <type>. Valid types are bug, cleanup, design, documentation,
  feature, flake, misc, question, tep
• Complies with Catalog Organization TEP, see example. Note An issue has been filed to automate this validation

  • File path follows <kind>/<name>/<version>/name.yaml

  • Has README.md at <kind>/<name>/<version>/README.md

  • Has mandatory metadata.labels - app.kubernetes.io/version the same as the <version> of the resource

  • Has mandatory metadata.annotations tekton.dev/pipelines.minVersion

  • mandatory spec.description follows the convention

      ```
    
      spec:
        description: >-
          one line summary of the resource
    
          Paragraph(s) to describe the resource.
      ```
    

See the contribution guide for more details.

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please ask for approval from vdemeester after the PR has been reviewed.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment