Remove deprecated GenericPropertiesContextLoader from the TCF

Since GenericPropertiesContextLoader was deprecated in Spring Framework
5.3, we have decided to remove it in Spring Framework 6.0.

Closes gh-28911

Author: sbrannen

spring-test/src/main/java/org/springframework/test/context/support/GenericPropertiesContextLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -93,8 +93,6 @@
 	RelativePathSpringJUnit4ClassRunnerAppCtxTests.class,//
 	MultipleResourcesSpringJUnit4ClassRunnerAppCtxTests.class,//
 	InheritedConfigSpringJUnit4ClassRunnerAppCtxTests.class,//
-	PropertiesBasedSpringJUnit4ClassRunnerAppCtxTests.class,//
-	CustomDefaultContextLoaderClassSpringRunnerTests.class,//
 	ParameterizedDependencyInjectionTests.class,//
 	ConcreteTransactionalJUnit4SpringContextTests.class,//
 	ClassLevelTransactionalSpringRunnerTests.class,//

spring-test/src/test/java/org/springframework/test/context/configuration/ContextConfigurationWithPropertiesExtendingPropertiesAndInheritedLoaderTests.java

@@ -223,20 +223,6 @@ static class ClassesBar extends ClassesFoo {
 	static class OverriddenClassesBar extends ClassesFoo {
 	}
 
-	@SuppressWarnings("deprecation")
-	@ContextConfiguration(locations = "/foo.properties", loader = org.springframework.test.context.support.GenericPropertiesContextLoader.class)
-	@ActiveProfiles("foo")
-	static class PropertiesLocationsFoo {
-	}
-
-	// Combining @Configuration classes with a Properties based loader doesn't really make
-	// sense, but that's OK for unit testing purposes.
-	@SuppressWarnings("deprecation")
-	@ContextConfiguration(classes = FooConfig.class, loader = org.springframework.test.context.support.GenericPropertiesContextLoader.class)
-	@ActiveProfiles("foo")
-	static class PropertiesClassesFoo {
-	}
-
 	@ContextConfiguration(classes = FooConfig.class, loader = AnnotationConfigContextLoader.class)
 	@NestedTestConfiguration(INHERIT)
 	static class OuterTestCase {