Replace VersionNumber usage with GradleVersion

VersionNumber is deprecated and to be removed in Gradle 8.

Fixes #24

src/main/java/com/google/gradle/osdetector/OsDetector.java

@@ -28,7 +28,7 @@
 import org.gradle.api.file.ProjectLayout;
 import org.gradle.api.file.RegularFile;
 import org.gradle.api.provider.ProviderFactory;
-import org.gradle.util.VersionNumber;
+import org.gradle.util.GradleVersion;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -82,7 +82,7 @@ public synchronized void setClassifierWithLikes(List<String> classifierWithLikes
 
   private synchronized Impl getImpl() {
     if (impl == null) {
-      if (compareGradleVersion(project, "6.5") >= 0) {
+      if (GradleVersion.current().compareTo(GradleVersion.version("6.5")) >= 0) {
         impl = new Impl(classifierWithLikes, new ConfigurationTimeSafeSystemPropertyOperations(),
             new ConfigurationTimeSafeFileOperations());
       } else {
@@ -92,11 +92,6 @@ private synchronized Impl getImpl() {
     return impl;
   }
 
-  private static int compareGradleVersion(Project project, String target) {
-    return VersionNumber.parse(project.getGradle().getGradleVersion()).compareTo(
-        VersionNumber.parse(target));
-  }
-
   /**
    * Accessor to information about the current OS release.
    */