chore(ci): Bump docker/build-push-action from 6.5.0 to 6.6.1 (#21030)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.5.0 to 6.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.5.0...v6.6.1)

---
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@v6.5.0
+        uses: docker/build-push-action@v6.6.1
         with:
           context: .
           file: ./scripts/environment/Dockerfile

.github/workflows/regression.yml

@@ -261,7 +261,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build 'vector' target image
-        uses: docker/build-push-action@v6.5.0
+        uses: docker/build-push-action@v6.6.1
         with:
           context: baseline-vector/
           cache-from: type=gha
@@ -299,7 +299,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Build 'vector' target image
-        uses: docker/build-push-action@v6.5.0
+        uses: docker/build-push-action@v6.6.1
         with:
           context: comparison-vector/
           cache-from: type=gha