Touch up spacing in rustup command

Author: dtolnay

action.yml

@@ -61,7 +61,7 @@ runs:
 
     - run: |
         : install rustup if needed
-        if ! command -v rustup &> /dev/null ; then
+        if ! command -v rustup &>/dev/null; then
           curl --proto '=https' --tlsv1.2 --retry 10 --retry-connrefused -fsSL "https://sh.rustup.rs" | sh -s -- --default-toolchain none -y
           echo "${CARGO_HOME:-$HOME/.cargo}/bin" >> $GITHUB_PATH
         fi