Bump image from 0.23.11 to 0.23.12

Bumps [image](https://github.com/image-rs/image) from 0.23.11 to 0.23.12.
- [Release notes](https://github.com/image-rs/image/releases)
- [Changelog](https://github.com/image-rs/image/blob/master/CHANGES.md)
- [Commits](image-rs/image@v0.23.11...v0.23.12)

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

Author: dependabot[bot]

Diff for: Cargo.lock

@@ -28,7 +28,7 @@ askalono = "0.4.3"
 bytecount = "0.6.0"
 clap = "2.33.3"
 strum = { version = "0.19.5", features = ["derive"] }
-image = "0.23.11"
+image = "0.23.12"
 regex = "1"
 error-chain = "0.12"
 toml = "0.5.7"