fix cd typo

Author: cjom

.github/workflows/build-toolchain-and-llvm-self-hosted.yaml

@@ -59,7 +59,7 @@ jobs:
           cd ..
           rm -rf "${{ github.workspace }}"
           mkdir -p "${{ github.workspace }}"
-          cd -rf "${{ github.workspace }}"
+          cd "${{ github.workspace }}"
           git clone --recurse-submodules --depth 1 --shallow-submodules "https://${{ github.repository_owner }}:${{ github.token }}@github.com/${{ github.repository }}.git" .
           git config --global --add safe.directory "${{ github.workspace }}"
           git config user.name "${{ github.repository_owner }}"