Recent grape changes break certain usage on Windows

@Grab('net.jqwik:jqwik:1.1.4')
import groovy.transform.CompileStatic
import net.jqwik.api.ForAll
import net.jqwik.api.Property
import net.jqwik.api.constraints.IntRange;

@CompileStatic
class Jsr308 {
    @Property
    boolean 'size zero or positive'(
            @ForAll List<Integer> items
    ) {
        items.size() >= 0
    }
}