build(deps): bump addressable from 2.8.0 to 2.9.0 in /kythe/web/site

Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.8.0 to 2.9.0.
- [Changelog](https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sporkmonger/addressable/compare/addressable-2.8.0...addressable-2.9.0)

---
updated-dependencies:
- dependency-name: addressable
  dependency-version: 2.9.0
  dependency-type: indirect
...

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