Bump sharp from 0.32.0 to 0.32.6 in /hack/favicons (#620)

Bumps [sharp](https://github.com/lovell/sharp) from 0.32.0 to 0.32.6.
- [Release notes](https://github.com/lovell/sharp/releases)
- [Changelog](https://github.com/lovell/sharp/blob/main/docs/changelog.md)
- [Commits](lovell/sharp@v0.32.0...v0.32.6)

---
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>