chore: update test matrix for Tekton Pipelines v1.9.0

Update the CI test matrix to use the latest Tekton Pipelines releases:
- latest: v1.9.0
- lts-latest: v1.9.0 (new LTS)
- lts-latest-minus-one: v1.6.0
- lts-latest-minus-two: v1.3.0
- lts-latest-minus-three: v1.0.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

.github/workflows/ci.yaml

@@ -48,15 +48,15 @@ jobs:
 
         include:
         - tekton-version: latest
-          pipeline-version: v1.7.0
+          pipeline-version: v1.9.0
         - tekton-version: lts-latest
-          pipeline-version: v1.6.0
+          pipeline-version: v1.9.0
         - tekton-version: lts-latest-minus-one
-          pipeline-version: v1.3.0
+          pipeline-version: v1.6.0
         - tekton-version: lts-latest-minus-two
-          pipeline-version: v1.0.0
+          pipeline-version: v1.3.0
         - tekton-version: lts-latest-minus-three
-          pipeline-version: v0.68.1
+          pipeline-version: v1.0.0
 
     env:
       KO_DOCKER_REPO: registry.local:5000/tekton