pin rust toolchain version in rust-toolchain file #2513
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This is a less verbose alternative to #2512 that uses the rustup rust-toolchain file to pin the version of rust so new releases can't cause CI failures. Ideally
actions-rs/toolchain
should be able to supportrust-toolchain.toml
which already exists in this repo but it looks like there are a few PRs that haven't been updated in a while for adding support there. We may want to fork that action underhelix-editor
and merge it ourselves to make this less hacky.