Update afl requirement from 0.12.0 to 0.13.1

Updates the requirements on [afl](https://github.com/rust-fuzz/afl.rs) to permit the latest version.
- [Changelog](https://github.com/rust-fuzz/afl.rs/blob/master/CHANGES.md)
- [Commits](https://github.com/rust-fuzz/afl.rs/commits)

---
updated-dependencies:
- dependency-name: afl
  dependency-type: direct:production
...

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

Cargo.toml

@@ -28,7 +28,7 @@ cfg-if = "1.0.0"
 
 [dependencies.afl]
 optional = true
-version = "0.12.0"
+version = "0.13.1"
 
 [dev-dependencies]
 clap = { version = "4.0", features = ["derive"] }