Bump docker/build-push-action from 5 to 6 (#161)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

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

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

.github/workflows/docker-image.yml

@@ -28,7 +28,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
 
       - name: Build and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         if: ${{ github.ref_name == 'main' }}
         env:
           IMAGE_TAG: ${{ inputs.tag }}
@@ -40,7 +40,7 @@ jobs:
           tags: tabulario/spark-iceberg:latest,tabulario/spark-iceberg:${{ inputs.tag }}
 
       - name: Build and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         if: ${{ github.ref_name != 'main' }}
         env:
           IMAGE_TAG: ${{ inputs.tag }}