chore(deps): bump @ipld/dag-pb from 3.0.2 to 4.0.0 in /examples

Bumps [@ipld/dag-pb](https://github.com/ipld/js-dag-pb) from 3.0.2 to 4.0.0.
- [Release notes](https://github.com/ipld/js-dag-pb/releases)
- [Changelog](https://github.com/ipld/js-dag-pb/blob/master/CHANGELOG.md)
- [Commits](ipld/js-dag-pb@v3.0.2...v4.0.0)

---
updated-dependencies:
- dependency-name: "@ipld/dag-pb"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/package.json

@@ -18,7 +18,7 @@
     "@ipld/car": "file:..",
     "@ipld/dag-cbor": "^8.0.0",
     "@ipld/dag-json": "^9.0.1",
-    "@ipld/dag-pb": "^3.0.0",
+    "@ipld/dag-pb": "^4.0.0",
     "@multiformats/blake2": "^1.0.1",
     "@types/varint": "^6.0.0",
     "multiformats": "^11.0.0",