Bump docker/build-push-action from 3 to 4

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 4.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v4)

---
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]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: ghcr.io
       - name: Build
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: builders/${{ matrix.entry.tag }}
           outputs: type=docker,dest=/tmp/image.tar
@@ -69,7 +69,7 @@ jobs:
           name: ruby.wasm-builder-${{ matrix.entry.tag }}
           path: /tmp/image.tar
       - name: Push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: builders/${{ matrix.entry.tag }}
           push: ${{ github.ref == 'refs/heads/main' }}