Use the 1.81 toolchain instead of latest #355
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What
Use the 1.81 toolchain instead of latest.
Why
Rust versions later than 1.81 come with a wasm target that isn't compatible with Soroban Env. This is a known issue, and in the near future a new wasm target will be adopted once it is available in the Rust compiler.
It's possible for some simple contracts to sitll work with later versions of Rust, and that' sthe case for most examples in this repo. However one example just started failing, hence why pinning the version just now.