Fix console compiler warning: ReflectionDiffBuilderTest.java:[172,52]

non-varargs call of varargs method with inexact argument type for last
parameter

Author: garydgregory

src/test/java/org/apache/commons/lang3/builder/ReflectionDiffBuilderTest.java

@@ -169,7 +169,7 @@ void testGetExcludeFieldNamesWithNullExcludedFieldNamesCtor() {
         final ReflectionDiffBuilder<TypeTestClass> reflectionDiffBuilder =
                 new ReflectionDiffBuilder<>(new TypeTestClass(), new TypeTestChildClass(), SHORT_STYLE);
         // @formatter:on
-        reflectionDiffBuilder.setExcludeFieldNames(null);
+        reflectionDiffBuilder.setExcludeFieldNames((String[]) null);
         final String[] excludeFieldNames = reflectionDiffBuilder.getExcludeFieldNames();
         assertNotNull(excludeFieldNames);
         assertEquals(0, excludeFieldNames.length);