Use ClassLoader from ResourceLoader to load PropertySourceLoaders

Fixes gh-44427

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -89,7 +89,7 @@ public StandardConfigDataLocationResolver(DeferredLogFactory logFactory, Binder
 			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);
 	}