Include .crates.toml in Rust example

Using the existing example, cargo install will error out after restoring a cache:
```
cargo install cargo-tarpaulin
    Updating crates.io index
error: binary `cargo-tarpaulin` already exists in destination
Add --force to overwrite
Error: Process completed with exit code 101.
```

`--force` is undesirable because it will recompile the binary.  Cargo is scared of the existing binary because it doesn't have enough information about it.  Including `~/.cargo/.crates.toml` coaxes it into being okay with the situation.
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Tommy G 2023-05-04 16:33:36 +10:00 committed by GitHub
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@ -591,6 +591,7 @@ whenever possible:
- uses: actions/cache@v3 - uses: actions/cache@v3
with: with:
path: | path: |
~/.cargo/.crates.toml
~/.cargo/bin/ ~/.cargo/bin/
~/.cargo/registry/index/ ~/.cargo/registry/index/
~/.cargo/registry/cache/ ~/.cargo/registry/cache/