add operator v0.73.x docs

Signed-off-by: Jeeva Kandasamy <jkandasa@redhat.com>

sync/config/operator.yaml

@@ -29,6 +29,16 @@ archive: https://github.com/tektoncd/operator/tags
 #       header: <dict>         # optional, no header added if not set
 #         See https://www.docsy.dev/docs/adding-content/navigation/#section-menu
 tags:
+  - name: release-v0.73.x
+    displayName: v0.73.x-LTS
+    supportEnds: "2025-10-01" # YYYY-MM-DD
+    # Dict of folders to sync
+    folders:
+      docs:
+        index: README.md
+        include: ['*.md']
+        exclude:
+          - TektonOperator.md
   - name: release-v0.71.x
     displayName: v0.71.x-LTS
     supportEnds: "2025-06-06" # YYYY-MM-DD
@@ -59,16 +69,6 @@ tags:
         include: ['*.md']
         exclude:
           - TektonOperator.md
-  - name: release-v0.68.x
-    displayName: v0.68.x-LTS
-    supportEnds: "2024-09-22" # YYYY-MM-DD
-    # Dict of folders to sync
-    folders:
-      docs:
-        index: README.md
-        include: ['*.md']
-        exclude:
-          - TektonOperator.md
   - name: main
     # The name to display on tekton.dev.
     # helper.py will use this value in the version switcher and other places.