chore(ci): Bump docker/build-push-action from 6.7.0 to 6.9.0 (#21388)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.7.0 to 6.9.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.7.0...v6.9.0)

---
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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/environment.yml

@@ -59,7 +59,7 @@ jobs:
             org.opencontainers.image.title=Vector development environment
             org.opencontainers.image.url=https://github.com/vectordotdev/vector
       - name: Build and push
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           file: ./scripts/environment/Dockerfile

.github/workflows/regression.yml

@@ -262,7 +262,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build 'vector' target image
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: baseline-vector/
           cache-from: type=gha
@@ -300,7 +300,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build 'vector' target image
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: comparison-vector/
           cache-from: type=gha