Merge branch '3.4.x'

Closes gh-44451

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/StandardConfigDataLocationResolver.java

@@ -87,7 +87,7 @@ public class StandardConfigDataLocationResolver
 			ResourceLoader resourceLoader) {
 		this.logger = logFactory.getLog(StandardConfigDataLocationResolver.class);
 		this.propertySourceLoaders = SpringFactoriesLoader.loadFactories(PropertySourceLoader.class,
-				getClass().getClassLoader());
+				resourceLoader.getClassLoader());
 		this.configNames = getConfigNames(binder);
 		this.resourceLoader = new LocationResourceLoader(resourceLoader);
 	}