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](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]>

.github/workflows/main.yml

@@ -76,7 +76,7 @@ jobs:
         password: ${{ secrets.DOCKERHUBPASSWD }}
 
     - name: Build Docker
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         file: docker/Dockerfile
         context: .
@@ -108,7 +108,7 @@ jobs:
         github.event_name == 'push'
         && github.ref == 'refs/heads/develop'
         && steps.changes.outputs.docker == 'true'
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         file: docker/Dockerfile
         context: .