Previously, our GitHub actions specified the Rust toolchain as `dtolnay/rust-toolchain@stable`, which meant the version could change out from under us. In this case, the move from 1.86 to 1.87 introduced new clippy warnings, causing build failures. Because it will take a little time to fix all the new clippy warnings, this PR pins things to 1.86 for now to unbreak the build. It also replaces `io::Error::new(io::ErrorKind::Other)` with `io::Error::other()` in preparation for 1.87.
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