Groovy formatting with Spotless leaves a temporary directory

Running `./mvnw spotless:apply` with spotless setup to format Groovy a temporary directory is left in the root. See the following reproducer project: https://github.com/attiand/spotless-tmp-file-issue

I would have no problem if the plugin left temporary directories in the Maven `target` directory, but it is annoying in the project root.

The file was named like this: `file%3A%2Ftmp%2Fspotless-groovy10387858394287009044%2F`

* Maven version: 3.8.4
* Spotless version: 2.43.0
* Red Hat Enterprise Linux release 9.3
* See: https://github.com/attiand/spotless-tmp-file-issue

Start by running ./mvnw spotless:apply in the linked reproducer project and inspect where the root-level temporary directory is created during Groovy formatting. Trace that behavior through the Maven and Groovy formatting integration; done means formatting leaves no temporary directory in the project root, with regression coverage for the reproducer case.

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