Update docker/build-push-action action to v6 (#144)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/CI.yml

@@ -23,7 +23,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: base-fullbuild/
           file: base-fullbuild/Dockerfile