Fix bench CI job

Author: tyranron

.github/workflows/ci.yml

@@ -98,6 +98,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@v1
         with:
           toolchain: stable
+          components: clippy
 
       - run: cargo clippy -p juniper_benchmarks --benches -- -D warnings
       - run: cargo bench -p juniper_benchmarks