test(fuzz)(deps): update tikv-jemallocator requirement in /fuzz

Updates the requirements on [tikv-jemallocator](https://github.com/tikv/jemallocator) to permit the latest version.
- [Release notes](https://github.com/tikv/jemallocator/releases)
- [Changelog](https://github.com/tikv/jemallocator/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tikv/jemallocator/commits)

---
updated-dependencies:
- dependency-name: tikv-jemallocator
  dependency-type: direct:production
...

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

fuzz/Cargo.toml

@@ -12,7 +12,7 @@ cargo-fuzz = true
 libfuzzer-sys = "0.4"
 arbitrary = { version = "1.3.2", features = ["derive"] }
 replace_with = "0.1.7"
-tikv-jemallocator = "0.5.4"
+tikv-jemallocator = "0.6.0"
 
 [dependencies.zip]
 path = ".."