dependabot: 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-deploy.yml

@@ -39,7 +39,7 @@ jobs:
 
       - name: Build epic production image
         if: matrix.apps == 'epic'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           builder: ${{ steps.buildx.outputs.name }}
@@ -84,7 +84,7 @@ jobs:
 
       - name: Build staging docker image
         if: matrix.apps == 'deploy'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           builder: ${{ steps.buildx.outputs.name }}