Restrict base version for cross version test

So it doesn't try to run on pre 5.x versions. PathSensitivity has been
introduced in 3.1, though it doesn't make much sense to run the test
pre 5.0.

#11330

subprojects/integ-test/src/crossVersionTest/groovy/org/gradle/integtests/TaskSubclassingBinaryCompatibilityCrossVersionSpec.groovy

@@ -43,6 +43,7 @@ import org.gradle.plugins.ide.idea.GenerateIdeaProject
 import org.gradle.plugins.ide.idea.GenerateIdeaWorkspace
 import org.gradle.plugins.signing.Sign
 import org.gradle.util.GradleVersion
+import org.junit.Assume
 import spock.lang.Issue
 
 /**
@@ -214,6 +215,8 @@ apply plugin: SomePlugin
 
     @Issue("https://github.com/gradle/gradle/issues/11330")
     def "a subclass of JavaCompile with getSources receives the correct incremental changes"() {
+        // There is no use to make the test work pre-5.0, since the regression was introduced in 6.0
+        Assume.assumeTrue(previous.version.baseVersion >= GradleVersion.version("5.0"))
         given:
         file("producer/build.gradle") << """
             apply plugin: 'java'
@@ -255,7 +258,7 @@ apply plugin: SomePlugin
             
             apply plugin: 'java'
     
-            tasks.register("myJavaCompile", MyCompileTask) {
+            task myJavaCompile(type: MyCompileTask) {
                 def sourceSet = sourceSets.main
                 def sourceDirectorySet = sourceSet.java
                 addSource(sourceDirectorySet)