Annotation processors should support the latest source version

PiperOrigin-RevId: 539146277
Change-Id: I0b960762cf57de825da57a3c324dcc68030119e5
diff --git a/src/test/shell/integration/java_integration_test.sh b/src/test/shell/integration/java_integration_test.sh
index da88e91..9e6c071 100755
--- a/src/test/shell/integration/java_integration_test.sh
+++ b/src/test/shell/integration/java_integration_test.sh
@@ -590,6 +590,10 @@
 import javax.lang.model.element.*;
 @SupportedAnnotationTypes(value= {"test.processor.TestAnnotation"})
 public class Processor extends AbstractProcessor {
+  @Override
+  public SourceVersion getSupportedSourceVersion() {
+    return SourceVersion.latestSupported();
+  }
   private static final String OUTFILE_CONTENT = "package test;\n"
       + "public class Generated {\n"
       + "  public static String value = \"" + ProcessorDep.value + "\";\n"