Bump sharp and sponsorkit in /scripts/sponsors (#3060)

Bumps [sharp](https://github.com/lovell/sharp) to 0.32.6 and updates ancestor dependency [sponsorkit](https://github.com/antfu/sponsorkit). These dependencies need to be updated together.


Updates `sharp` from 0.31.3 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@v0.31.3...v0.32.6)

Updates `sponsorkit` from 0.8.2 to 0.8.9
- [Release notes](https://github.com/antfu/sponsorkit/releases)
- [Commits](antfu-collective/sponsorkit@v0.8.2...v0.8.9)

---
updated-dependencies:
- dependency-name: sharp
  dependency-type: indirect
- dependency-name: sponsorkit
  dependency-type: direct:production
...

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