build: Bump itoa from 1.0.8 to 1.0.9 in /fuzz

Bumps [itoa](https://github.com/dtolnay/itoa) from 1.0.8 to 1.0.9.
- [Release notes](https://github.com/dtolnay/itoa/releases)
- [Commits](https://github.com/dtolnay/itoa/compare/1.0.8...1.0.9)

---
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

@@ -350,9 +350,9 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b02a5381cc465bd3041d84623d0fa3b66738b52b8e2fc3bab8ad63ab032f4a"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jobserver"