Release 4.1.0

4.1.0

• Bump dylint's MSRV to 1.81 (b371376)
• Eliminate reliance on dirs (6a3e936)
• Eliminate uses of once_cell::sync::Lazy (#1517)
• Check for both rust-toolchain and rust-toolchain.toml files when determining Rust toolchain channel (9ac18a2)