`Cannot fingerprint input property 'gemConfiguration'`

I have:

```gradle
task rubocop(type: JRubyExec) {
	jruby.gemConfiguration 'rubocop'
	...
}
```

When running on Gradle 8 this leads to:

```
Cannot fingerprint input property 'gemConfiguration': value 'configuration ':rubocop'' cannot be serialized.
```

cc @donv, @UweKubosch 