ruff

e1504781 - Update Rust toolchain file to use TOML format (#7339)

Update Rust toolchain file to use TOML format (#7339) Ref https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file Should resolve Dependabot failure at https://github.com/astral-sh/ruff/network/updates/721380342 Follows #7034