Remove explicit type arguments

See gh-10494

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/metadata/ItemHint.java

@@ -78,7 +78,7 @@ public class ItemHint implements Comparable<ItemHint> {
 
 	public static ItemHint newHint(String name, ValueHint... values) {
 		return new ItemHint(name, Arrays.asList(values),
-				Collections.<ValueProvider>emptyList());
+				Collections.emptyList());
 	}
 
 	@Override

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -819,10 +819,10 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 	@Test
 	public void mergingOfHintWithProvider() throws Exception {
 		writeAdditionalHints(new ItemHint("simple.theName",
-				Collections.<ItemHint.ValueHint>emptyList(),
+				Collections.emptyList(),
 				Arrays.asList(
 						new ItemHint.ValueProvider("first",
-								Collections.<String, Object>singletonMap("target",
+								Collections.singletonMap("target",
 										"org.foo")),
 						new ItemHint.ValueProvider("second", null))));
 		ConfigurationMetadata metadata = compile(SimpleProperties.class);

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/metadata/JsonMarshallerTests.java

@@ -57,7 +57,7 @@ public class JsonMarshallerTests {
 		metadata.add(new ItemHint("d", null,
 				Arrays.asList(
 						new ItemHint.ValueProvider("first",
-								Collections.<String, Object>singletonMap("target",
+								Collections.singletonMap("target",
 										"foo")),
 				new ItemHint.ValueProvider("second", null))));
 		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();