Update rust.yml

Fixed rustfmt toolchain in CI

Author: dssgabriel

.github/workflows/rust.yml

@@ -22,6 +22,7 @@ jobs:
         rustup install nightly
         rustup override set nightly
         rustup component add clippy --toolchain nightly-x86_64-unknown-linux-gnu
+        rustup component add rustfmt --toolchain nightly-x86_64-unknown-linux-gnu
 
     - name: Toolchain info
       run: |