Cache additional Cargo files to fix "binary already exists" CI errors

This should fix these errors:

```
error: binary `wasm-bindgen` already exists in destination
binary `wasm-bindgen-test-runner` already exists in destination
binary `wasm2es6js` already exists in destination
```

See rust-lang/cargo#11513.

.github/workflows/ci.yml

@@ -17,6 +17,8 @@ jobs:
       with:
         path: |
           ~/.cargo/bin/
+          ~/.cargo/.crates.toml
+          ~/.cargo/.crates2.json
           ~/.cargo/registry/index/
           ~/.cargo/registry/cache/
           ~/.cargo/git/db/