ops: add a Rust cache for generate-3p-notices

Author: georgeh0

.github/workflows/release.yml

@@ -102,6 +102,8 @@ jobs:
       - uses: actions/download-artifact@v4
         with:
           name: Cargo.toml
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@v2
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
       - name: Install cargo-about