Update serde_yaml requirement from 0.8 to 0.9 (AFLplusplus#2185)

Updates the requirements on [serde_yaml](https://github.com/dtolnay/serde-yaml) to permit the latest version.
- [Release notes](https://github.com/dtolnay/serde-yaml/releases)
- [Commits](dtolnay/serde-yaml@0.8.0...0.9.34)

---
updated-dependencies:
- dependency-name: serde_yaml
  dependency-type: direct:production
...

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

libafl_qemu/Cargo.toml

@@ -87,7 +87,7 @@ addr2line = "0.21"
 typed-arena = "2.0"
 paste = "1"
 enum-map = "2.7"
-serde_yaml = { version = "0.8", optional = true } # For parsing the injections yaml file
+serde_yaml = { version = "0.9", optional = true } # For parsing the injections yaml file
 toml = { version = "0.4.2", optional = true } # For parsing the injections toml file
 pyo3 = { version = "0.18", optional = true , features = ["multiple-pymethods"]}
 bytes-utils = "0.1"