Update Rust lang doc for 1.0.0 dependency (bytecodealliance#4935)

docs/lang-rust.md

@@ -43,7 +43,7 @@ dependency in `Cargo.toml`:
 
 ```toml
 [dependencies]
-wasmtime = "0.33.0"
+wasmtime = "1.0.0"
 ```
 
 Next up let's write the code that we need to execute this wasm file. The