Can't run the test script due to invalid Cargo.lock file

```
warning: unused manifest key: workaround-build-dependencies
error: failed to parse lock file at: selfe-config/Cargo.lock

Caused by:
  invalid serialized PackageId for key `package.dependencies`
```

Seems to be related to https://github.com/rust-lang/cargo/pull/7579 combined with our `cargo-5730` and xbuild configuration, possibly requiring an older version of cargo to workaround.