Only cache the cargo registry

Author: orf

.github/workflows/test.yaml

@@ -10,6 +10,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          # Only cache the cargo registry
+          cache-targets: false
+
       - name: Run sccache-cache
         uses: mozilla-actions/[email protected]