build: bump itoa from 0.4.7 to 0.4.8 in /fuzz

Bumps [itoa](https://github.com/dtolnay/itoa) from 0.4.7 to 0.4.8.
- [Release notes](https://github.com/dtolnay/itoa/releases)
- [Commits](https://github.com/dtolnay/itoa/compare/0.4.7...0.4.8)

---
updated-dependencies:
- dependency-name: itoa
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

fuzz/Cargo.lock

@@ -304,9 +304,9 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "0.4.7"
+version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd25036021b0de88a0aff6b850051563c6516d0bf53f8638938edbb9de732736"
+checksum = "b71991ff56294aa922b450139ee08b3bfc70982c6b2c7562771375cf73542dd4"
 
 [[package]]
 name = "kvm-bindings"