chore(deps): update docker/build-push-action action to v7 (release-1.28) (cloudnative-pg#10187)

Author: renovate[bot]

.github/workflows/continuous-delivery.yml

@@ -493,7 +493,7 @@ jobs:
       # NOTE: we only fire this in TEST DEPTH = 4, as that is the level of the
       # upgrade test
         name: Build and push image for upgrade test
-        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
+        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7
         id: build-prime
         if: |
           always() && !cancelled() &&