update CONTRIBUTING

Author: Phil Cummins

CONTRIBUTING.md

@@ -21,17 +21,7 @@ switch.
 ### Prerequisites
 
 - Tools needed to build [CPython](https://github.com/python/cpython) (Make, Clang, etc.)
-- [Rust](https://rustup.rs/) stable 1.71 or later *and* nightly 2023-07-27 or later, including the `wasm32-wasi` and `wasm32-unknown-unknown` targets
-  - Note that we currently use the `-Z build-std` Cargo option to build the `componentize-py` runtime with position-independent code (which is not the default for `wasm32-wasi`) and this requires using a recent nightly build of Rust.
-  
-For Rust, something like this should work once you have `rustup`:
-
-```shell
-rustup update
-rustup install nightly
-rustup component add rust-src --toolchain nightly
-rustup target add wasm32-wasi wasm32-unknown-unknown
-```
+- [Rust](https://rustup.rs/) stable 1.81.0
 
 ### Building and Running