fix(deps): bump bufferutil from 4.0.5 to 4.0.6

Bumps [bufferutil](https://github.com/websockets/bufferutil) from 4.0.5 to 4.0.6.
- [Release notes](https://github.com/websockets/bufferutil/releases)
- [Commits](websockets/bufferutil@v4.0.5...v4.0.6)

---
updated-dependencies:
- dependency-name: bufferutil
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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