chore(deps): Bump docker/build-push-action from 6.7.0 to 6.8.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.7.0...v6.8.0)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/on_pr.yaml

@@ -127,7 +127,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build armv7
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           context: .
           push: false
@@ -167,7 +167,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build arm64
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           context: .
           push: false
@@ -207,7 +207,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build amd64
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           context: .
           push: false