chore(deps): Update afl requirement from 0.14.1 to 0.15.5

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>

fuzz/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-afl = "0.14.1"
+afl = "0.15.5"
 arbitrary = { version = "1.3.0", features = ["derive"] }
 
 [dependencies.b4s]