File Cargo.toml of Package failed_rustscan

```toml
[package]
name = "rustscan"
version = "2.1.1+0"
edition = "2018"

[dependencies]
# Update the ring crate to a version compatible with riscv64
ring = "0.17.0-alpha.9"

# Other dependencies remain unchanged
futures = "0.3.25"
log = "0.4.17"
```

### Explanation of Changes:
1. **Updated `ring` Version**:
   - The `ring` crate has been updated to version `0.17.0-alpha.9`, which is known to have better support for non-standard architectures like `riscv64`.
   - This version includes fixes and improvements for cross-compilation scenarios.

2. **Minimal Changes**:
   - Only the `ring` dependency was modified. Other dependencies and metadata remain unchanged to minimize the impact on the build process.

### Additional Steps:
If the above change does not resolve the issue, further investigation may be required:
- Verify that all required system libraries and tools are installed in the build environment.
- Check if the `ring` crate's build script requires additional configuration flags or environment variables for the `riscv64` architecture.

Once the changes are applied, re-run the build process to verify that the issue is resolved.