chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build and push
         id: docker_build
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: |
@@ -41,7 +41,7 @@ jobs:
             sourcegraph/scip-typescript:${{ env.MAJOR }}
       - name: Build and push
         id: docker_build_autoindex
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile.autoindex
           push: true