Bump braces and pkg in /v8/tools/clusterfuzz/js_fuzzer

Bumps [braces](https://github.com/micromatch/braces) to 3.0.3 and updates ancestor dependency [pkg](https://github.com/vercel/pkg). These dependencies need to be updated together.


Updates `braces` from 2.3.2 to 3.0.3
- [Changelog](https://github.com/micromatch/braces/blob/master/CHANGELOG.md)
- [Commits](https://github.com/micromatch/braces/commits/3.0.3)

Updates `pkg` from 4.3.4 to 4.5.1
- [Release notes](https://github.com/vercel/pkg/releases)
- [Commits](vercel/pkg@4.3.4...4.5.1)

---
updated-dependencies:
- dependency-name: braces
  dependency-type: indirect
- dependency-name: pkg
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>