Bump docker/build-push-action from 5.2.0 to 6.18.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.2.0 to 6.18.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5.2.0...v6.18.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/buildAndPushContainer.yml

@@ -37,7 +37,7 @@ jobs:
 
       - name: Build and push Docker image 🛠️💾↗️
         if: ${{ github.event_name != 'pull_request' }}
-        uses: docker/build-push-action@v5.2.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: ./2_supplychain/2_praxis/DemoContainerSecurity/container/
           file: ./2_supplychain/2_praxis/DemoContainerSecurity/container/Dockerfile
@@ -51,7 +51,7 @@ jobs:
 
       - name: Build and push Docker image for pull request 🛠️💾↗️
         if: ${{ github.event_name == 'pull_request' }}
-        uses: docker/build-push-action@v5.2.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: ./2_supplychain/2_praxis/DemoContainerSecurity/container/
           file: ./2_supplychain/2_praxis/DemoContainerSecurity/container/Dockerfile