Bump libwebp-sys2 from 0.1.2 to 0.1.9 in /fuzz

Bumps [libwebp-sys2](https://github.com/qnighy/libwebp-sys2-rs) from 0.1.2 to 0.1.9.
- [Release notes](https://github.com/qnighy/libwebp-sys2-rs/releases)
- [Changelog](https://github.com/qnighy/libwebp-sys2-rs/blob/master/CHANGELOG.md)
- [Commits](qnighy/libwebp-sys2-rs@v0.1.2...v0.1.9)

---
updated-dependencies:
- dependency-name: libwebp-sys2
  dependency-type: indirect
...

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