Bump nanoid from 3.3.7 to 3.3.8 in /docs/sliver-docs

Bumps [nanoid](https://github.com/ai/nanoid) from 3.3.7 to 3.3.8.
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](ai/nanoid@3.3.7...3.3.8)

---
updated-dependencies:
- dependency-name: nanoid
  dependency-type: indirect
...

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