build(deps): bump sharp from 0.30.3 to 0.30.6 in /docs (golangci#2900)

Bumps [sharp](https://github.com/lovell/sharp) from 0.30.3 to 0.30.6.
- [Release notes](https://github.com/lovell/sharp/releases)
- [Changelog](https://github.com/lovell/sharp/blob/main/docs/changelog.md)
- [Commits](lovell/sharp@v0.30.3...v0.30.6)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]