build(deps): bump cipher-base in /tools/subgraph-example

Bumps [cipher-base](https://github.com/crypto-browserify/cipher-base) from 1.0.4 to 1.0.6.
- [Changelog](https://github.com/browserify/cipher-base/blob/master/CHANGELOG.md)
- [Commits](browserify/cipher-base@v1.0.4...v1.0.6)

---
updated-dependencies:
- dependency-name: cipher-base
  dependency-version: 1.0.6
  dependency-type: indirect
...

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

Author: dependabot[bot]