build(deps): bump docker/build-push-action from 5 to 6

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](https://github.com/docker/build-push-action/compare/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] <support@github.com>

.github/workflows/publish.yml

@@ -53,7 +53,7 @@ jobs:
           echo "KUBECTL_VERSION=$(grep -oP '^KUBECTL_VERSION\s*\?=\s*\K.*' makefile)" >> $GITHUB_ENV
       - name: Build and push - Docker/ECR
         id: docker_build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/s390x
@@ -72,7 +72,7 @@ jobs:
 
       - name: Build and push ubi image - Docker/ECR
         id: docker_build_ubi
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/s390x
@@ -92,7 +92,7 @@ jobs:
 
       - name: Build and push fips ubi image - Docker/ECR
         id: docker_build_fips_ubi
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/s390x