Add docs for the `cachekey` output to the README

It seems like it's being output, just wasn't documented: https://github.com/actions-rust-lang/setup-rust-toolchain/blob/main/action.yml#L144
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Predrag Gruevski 2023-10-17 22:01:06 -04:00 committed by GitHub
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@ -72,10 +72,11 @@ You can read more rustflags, and their load order, in the [Cargo reference].
## Outputs
| Name | Description |
| ---------------- | ----------------------------------------- |
| ---------------- | ------------------------------------------- |
| `rustc-version` | Version as reported by `rustc --version` |
| `cargo-version` | Version as reported by `cargo --version` |
| `rustup-version` | Version as reported by `rustup --version` |
| `cachekey` | A short hash of the installed rustc version |
## License