chore(deps): bump afl from 0.15.5 to 0.15.6 (#863)

Bumps [afl](https://github.com/rust-fuzz/afl.rs) from 0.15.5 to 0.15.6.
- [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
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -11,5 +11,5 @@ name = "fuzz"
 path = "src/main.rs"
 
 [dependencies]
-afl = "0.15.5"
+afl = "0.15.6"
 vrl = { path = "../../" }