Update webp-animation requirement from 0.8 to 0.9 (#46)

Updates the requirements on [webp-animation](https://github.com/blaind/webp-animation) to permit the latest version.
- [Release notes](https://github.com/blaind/webp-animation/releases)
- [Changelog](https://github.com/blaind/webp-animation/blob/main/CHANGELOG.md)
- [Commits](blaind/webp-animation@v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: webp-animation
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: msrd0 <[email protected]>

lottieconv/Cargo.toml

@@ -37,4 +37,4 @@ clap = { version = "4.0", features = ["derive"], optional = true }
 gif_crate = { package = "gif", version = "0.11.3", optional = true }
 rgb = { version = "0.8.32", default-features = false }
 rlottie = { path = "../rlottie", version = "0.5.2" }
-webp-animation = { version = "0.8", optional = true }
+webp-animation = { version = "0.9", optional = true }