chore(deps): bump oxipng from 9.0.0 to 9.1.1

Bumps [oxipng](https://github.com/shssoichiro/oxipng) from 9.0.0 to 9.1.1.
- [Release notes](https://github.com/shssoichiro/oxipng/releases)
- [Changelog](https://github.com/shssoichiro/oxipng/blob/master/CHANGELOG.md)
- [Commits](shssoichiro/oxipng@v9.0.0...v9.1.1)

---
updated-dependencies:
- dependency-name: oxipng
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -57,7 +57,7 @@ fast_image_resize = { version = "3.0.4", optional = true }
 imagequant = { version = "4.3.1", default-features = false, optional = true }
 rgb = { version = "0.8.37", optional = true }
 mozjpeg = { version = "0.10.7", default-features = false, features = ["with_simd"], optional = true }
-oxipng = { version = "9.0", default-features = false, features = ["zopfli", "filetime"], optional = true }
+oxipng = { version = "9.1", default-features = false, features = ["zopfli", "filetime"], optional = true }
 webp = { version = "0.3.0", default-features = false, optional = true }
 ravif = { version = "0.11.4", optional = true }
 libavif = { version = "0.13.0", default-features = false, features = ["codec-aom"], optional = true }