.github: fix syntax error in clippy-linting

Fix syntax error in clippy-linting.yml, like "every step must
define a `uses` or `run` key".

.github/workflows/clippy-linting.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install rust
+        name: Install rust
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal