Update the compile-testing dependency.

Exclude another test on Java 8 that fails because that version doesn't handle
type annotations very well. This failure didn't show up previously because of a
bug in compile-testing.

RELNOTES=n/a
PiperOrigin-RevId: 495144680

value/pom.xml

@@ -129,7 +129,7 @@
       <dependency>
         <groupId>com.google.testing.compile</groupId>
         <artifactId>compile-testing</artifactId>
-        <version>0.20</version>
+        <version>0.21.0</version>
       </dependency>
       <dependency>
         <groupId>com.google.truth</groupId>

value/src/test/java/com/google/auto/value/processor/AutoValueCompilationTest.java

@@ -56,6 +56,11 @@
 public class AutoValueCompilationTest {
   @Rule public final Expect expect = Expect.create();
 
+  // Sadly we can't rely on JDK 8 to handle type annotations correctly.
+  // Some versions do, some don't. So skip the test unless we are on at least JDK 9.
+  private boolean typeAnnotationsWork =
+      Double.parseDouble(JAVA_SPECIFICATION_VERSION.value()) >= 9.0;
+
   @Test
   public void simpleSuccess() {
     // Positive test case that ensures we generate the expected code for at least one case.
@@ -256,6 +261,7 @@ public void testNoWarningsFromGenerics() {
 
   @Test
   public void testNestedParameterizedTypesWithTypeAnnotations() {
+    assume().that(typeAnnotationsWork).isTrue();
     JavaFileObject annotFileObject =
         JavaFileObjects.forSourceLines(
             "foo.bar.Annot",
@@ -1455,10 +1461,7 @@ public void correctBuilder() {
 
   @Test
   public void builderWithNullableTypeAnnotation() {
-    // Sadly we can't rely on JDK 8 to handle type annotations correctly.
-    // Some versions do, some don't. So skip the test unless we are on at least JDK 9.
-    double javaVersion = Double.parseDouble(JAVA_SPECIFICATION_VERSION.value());
-    assume().that(javaVersion).isAtLeast(9.0);
+    assume().that(typeAnnotationsWork).isTrue();
     JavaFileObject javaFileObject =
         JavaFileObjects.forSourceLines(
             "foo.bar.Baz",