Avoid deprecated Mockito methods

Issue: SPR-14880

Author: jhoeller

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -2706,13 +2706,13 @@ public void resolveEmbeddedValue() {
 		bf.addEmbeddedValueResolver(r3);
 		given(r1.resolveStringValue("A")).willReturn("B");
 		given(r2.resolveStringValue("B")).willReturn(null);
-		given(r3.resolveStringValue(isNull(String.class))).willThrow(new IllegalArgumentException());
+		given(r3.resolveStringValue(isNull())).willThrow(new IllegalArgumentException());
 
 		bf.resolveEmbeddedValue("A");
 
 		verify(r1).resolveStringValue("A");
 		verify(r2).resolveStringValue("B");
-		verify(r3, never()).resolveStringValue(isNull(String.class));
+		verify(r3, never()).resolveStringValue(isNull());
 	}
 
 	@Test