Update backport version for failure labels (#3063)

There have been improvements including adding a label to a pull request
when any backport on it has failed.

- Related VachaShah/backport#8

Signed-off-by: Peter Nied <peternied@hotmail.com>
Signed-off-by: Peter Nied <petern@amazon.com>

.github/workflows/backport.yml

@@ -22,7 +22,9 @@ jobs:
           installation_id: 22958780
 
       - name: Backport
-        uses: VachaShah/backport@v1.1.4
+        uses: VachaShah/backport@v2.2.0
         with:
           github_token: ${{ steps.github_app_token.outputs.token }}
           branch_name: backport/backport-${{ github.event.number }}
+          head_template: backport/backport-<%= number %>-to-<%= base %>
+          failure_labels: backport-failed