Bump glob-parent from 5.1.1 to 5.1.2 in /examples/grpc-web

Bumps [glob-parent](https://github.com/gulpjs/glob-parent) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/gulpjs/glob-parent/releases)
- [Changelog](https://github.com/gulpjs/glob-parent/blob/main/CHANGELOG.md)
- [Commits](gulpjs/glob-parent@v5.1.1...v5.1.2)

---
updated-dependencies:
- dependency-name: glob-parent
  dependency-type: indirect
...

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Author: dependabot[bot]