Bump docker/build-push-action from 6.7.0 to 6.8.0 (#1521)

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

.github/workflows/e2e.yaml

@@ -49,7 +49,7 @@ jobs:
  - name: Set up Docker Buildx
  uses: docker/setup-buildx-action@v3
  - name: Build
- uses: docker/build-push-action@v6.7.0
+ uses: docker/build-push-action@v6.8.0
  with:
  context: .
  file: images/Dockerfile.controller
@@ -71,7 +71,7 @@ jobs:
  - name: Set up Docker Buildx
  uses: docker/setup-buildx-action@v3
  - name: Build
- uses: docker/build-push-action@v6.7.0
+ uses: docker/build-push-action@v6.8.0
  with:
  context: .
  file: images/Dockerfile.executor

.github/workflows/images.yaml

@@ -51,7 +51,7 @@ jobs:
  tags: |
  type=raw,value=${{ steps.get_image_tag.outputs.image_tag }}
  - name: Build & Push
- uses: docker/build-push-action@v6.7.0
+ uses: docker/build-push-action@v6.8.0
  with:
  build-args: VERSION=${{ steps.get_image_tag.outputs.image_tag }}
  context: .