Adapt to API and functional changes in Spring Framework 6 to fix tests.

These changes are also possibly applicable to SDG on Spring Framework 5 and are a candidate for backporting.

Resolves gh-538.

Author: jxblum

Diff for: spring-data-geode/src/test/java/org/springframework/data/gemfire/config/annotation/AbstractGeodeSecurityIntegrationTests.java

@@ -248,7 +248,7 @@ LocalRegionFactoryBean<String, String> echoRegion(GemFireCache gemfireCache) {
 
 		CacheLoader<String, String> echoCacheLoader() {
 
-			return new CacheLoader<String, String>() {
+			return new CacheLoader<>() {
 
 				@Override
 				public String load(LoaderHelper<String, String> helper) throws CacheLoaderException {

Diff for: spring-data-geode/src/test/java/org/springframework/data/gemfire/config/annotation/EnableContinuousQueriesConfigurationIntegrationTests.java

@@ -163,7 +163,7 @@ ClientRegionFactoryBean<Long, TemperatureReading> temperatureReadingsRegion(GemF
 
 		private CacheListener<Long, TemperatureReading> temperatureReadingCounterListener() {
 
-			return new CacheListenerAdapter<Long, TemperatureReading>() {
+			return new CacheListenerAdapter<>() {
 
 				@Override
 				public void afterCreate(EntryEvent<Long, TemperatureReading> event) {
@@ -198,7 +198,7 @@ PartitionedRegionFactoryBean<Long, TemperatureReading> temperatureReadingsRegion
 
 		private CacheLoader<Long, TemperatureReading> temperatureReadingsLoader() {
 
-			return new CacheLoader<Long, TemperatureReading>() {
+			return new CacheLoader<>() {
 
 				@Override
 				public TemperatureReading load(LoaderHelper<Long, TemperatureReading> helper) throws CacheLoaderException {