Updates mergify backport actions for new minor version (#34921)

.mergify.yml

@@ -95,9 +95,9 @@ pull_request_rules:
           - automerge
       comment:
         message: automerge label removed due to a CI failure
-  - name: v1.16 feature-gate backport
+  - name: v1.17 feature-gate backport
     conditions:
-      - label=v1.16
+      - label=v1.17
       - label=feature-gate
     actions:
       backport:
@@ -108,21 +108,21 @@ pull_request_rules:
         labels:
           - feature-gate
         branches:
-          - v1.16
-  - name: v1.16 non-feature-gate backport
+          - v1.17
+  - name: v1.17 non-feature-gate backport
     conditions:
-      - label=v1.16
+      - label=v1.17
       - label!=feature-gate
     actions:
       backport:
         assignees: *BackportAssignee
         title: "{{ destination_branch }}: {{ title }} (backport of #{{ number }})"
         ignore_conflicts: true
         branches:
-          - v1.16
-  - name: v1.16 backport warning comment
+          - v1.17
+  - name: v1.17 backport warning comment
     conditions:
-      - label=v1.16
+      - label=v1.17
     actions:
       comment:
         message: >
@@ -133,9 +133,9 @@ pull_request_rules:
           refactoring, plumbing, cleanup, etc that are not strictly
           necessary to achieve the goal. Any of the latter should go only
           into master and ride the normal stabilization schedule.
-  - name: v1.17 feature-gate backport
+  - name: v1.18 feature-gate backport
     conditions:
-      - label=v1.17
+      - label=v1.18
       - label=feature-gate
     actions:
       backport:
@@ -145,21 +145,21 @@ pull_request_rules:
         labels:
           - feature-gate
         branches:
-          - v1.17
-  - name: v1.17 non-feature-gate backport
+          - v1.18
+  - name: v1.18 non-feature-gate backport
     conditions:
-      - label=v1.17
+      - label=v1.18
       - label!=feature-gate
     actions:
       backport:
         assignees: *BackportAssignee
         title: "{{ destination_branch }}: {{ title }} (backport of #{{ number }})"
         ignore_conflicts: true
         branches:
-          - v1.17
-  - name: v1.17 backport warning comment
+          - v1.18
+  - name: v1.18 backport warning comment
     conditions:
-      - label=v1.17
+      - label=v1.18
     actions:
       comment:
         message: >