Bump docker/build-push-action in /.github/workflows

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.17.0 to 6.18.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@1dc7386...2634353)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 6.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/container.yml

@@ -20,7 +20,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build & Push Slurm Base Image
-        uses: docker/build-push-action@1dc73863535b631f98b2378be8619f83b136f4a0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83
         with:
           context: ./containers/spindle-slurm-ubuntu/base
           platforms: linux/amd64