Bump docker/build-push-action from 5 to 6 (#943)

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-goss.yaml

@@ -70,7 +70,7 @@ jobs:
 
       - name: Build master goss image
         if: github.ref_name == 'master'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             GO_VERSION=${{ env.GO_VERSION_FROM_PROJECT }}
@@ -84,7 +84,7 @@ jobs:
 
       - name: Build release goss image
         if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             GO_VERSION=${{ env.GO_VERSION_FROM_PROJECT }}