multi configuration same language

So, due to an incompatibility down the stack with java 21 (at the time of this writing) I'm trying to have `cleanThat` skip a specific file. I'm not certain based on their docs if I can skip a specific file with this. Anyways, I tried this, hoping it might work (also tried adding a target)

```kts
java {
licenseHeader(copyright + javaLicense)
}

java {
targetExclude("**/TransactionBeanPostProcessorTest.java")
cleanthat().addMutators(listOf("SafeAndConsensual", "SafeButNotConsensual"))
}
```

yeah, that doesn't work, but could it? my hope was taking 2 passes, license header over everything, but clean that over most things. As it appears I'll have to choose to skip this one file entirely or remove clean that entirely (I doubt it finds problems for me anyways).