(#137) Support Gradle 8.7 via dynamically loaded ExclusiveFileAccessManager

fixes #137 (closed)

In Gradle 8.7 onwards this class was migrated out of the wrapper and back into an internal class of Gradle core in https://github.com/gradle/gradle/commit/8ab194a79fd9072d4d21a438b2a39b9af84c9094

I'm not a Groovy expert, so if there are major negative consequences of moving back to @CompileDynamic to handle this, and there is an alternate way to manage this, all good, just trying to help out.

Also not sure if I should have bumped the versions in the way I did, so let me know, or feel free to adjust.