chore: bump rust toolchain version
chore: bump rust toolchain version

SingingTree/rustfmt,rust-lang/rustfmt,rust-lang/rustfmt,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,SingingTree/rustfmt,graydon/rust,graydon/rust,aidancully/rust,graydon/rust