GrEclipse 4.28+ corrupts Groovy method references by formatting `::` as `: : `

Minimal report:
```groovy
s.write(tests, TestFQNSerializer::serialize)
```

Actual output:
```groovy
s.write(tests, TestFQNSerializer: : serialize)
```

The output is invalid Groovy and fails compilation.
Environment
Spotless Gradle plugin: `8.9.0`
GrEclipse: reproduced with `4.35` and `4.40`
Last known good GrEclipse version: `4.27`
Gradle: `9.7.0`
Pinning GrEclipse to `4.27` avoids the corruption.

I found no existing issue matching this exact formatting failure.

Reproduce the minimal Groovy example with Spotless Gradle plugin 8.9.0 and GrEclipse 4.35 or 4.40, then compare it with GrEclipse 4.27. Trace the GrEclipse formatting integration and its tests, if present; done means `TestFQNSerializer::serialize` remains unchanged and the formatted output compiles.

Written by the indexing model from the issue text.