Update wasmtime requirement from 16.0.0 to 19.0.2

Updates the requirements on [wasmtime](https://github.com/bytecodealliance/wasmtime) to permit the latest version.
- [Release notes](https://github.com/bytecodealliance/wasmtime/releases)
- [Changelog](https://github.com/bytecodealliance/wasmtime/blob/main/docs/WASI-some-possible-changes.md)
- [Commits](bytecodealliance/wasmtime@v16.0.0...v19.0.2)

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

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

Cargo.toml

@@ -48,6 +48,6 @@ hyper = { version = "1.1.0", features = ["http1", "server"] }
 hyper-util = { version = "0.1.2", features = ["tokio"] }
 tokio = { version = "1.35.1", features = ["fs", "macros", "net", "process"] }
 tokio-util = "0.7.10"
-wasmtime = "16.0.0"
+wasmtime = "19.0.2"
 wasmtime-wasi = "16.0.0"
 wasi-common = "16.0.0"