add pipeline v0.42

Updating the website configuration to include the latest
pipeline release - v0.42.0

sync/config/pipelines.yaml

@@ -26,6 +26,16 @@ archive: https://github.com/tektoncd/pipeline/tags
 #       header: <dict>         # optional, no header added if not set
 #         See https://www.docsy.dev/docs/adding-content/navigation/#section-menu
 tags:
+- name: release-v0.42.x
+  displayName: v0.42.x
+  # Dict of folders to sync
+  folders:
+    docs:
+      index: README.md
+      include: ['*.md']
+      exclude:
+        - api-spec.md
+        - tutorial.md
 - name: release-v0.41.x
   displayName: v0.41.x LTS
   # Dict of folders to sync