⬆️ Update GitHub Actions to v7

Author: renovate[bot]

.github/workflows/upstream-ci.yaml

@@ -201,7 +201,7 @@ jobs:
           fi
       - name: 🚀 Build
         id: build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           push: false
           # Intentionally rely on image ID rather than tags for smoke testing.

.github/workflows/upstream-deploy.yaml

@@ -113,7 +113,7 @@ jobs:
           username: ${{ steps.registry.outputs.owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: 🚀 Build
-        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6.19.2
+        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
         with:
           load: true
           # yamllint disable rule:line-length