Remove redundant cast

See gh-40985

Author: asashour

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystemProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -219,7 +219,7 @@ private PropertyResolver getPropertyResolver() {
 		if (this.environment instanceof ConfigurableEnvironment configurableEnvironment) {
 			PropertySourcesPropertyResolver resolver = new PropertySourcesPropertyResolver(
 					configurableEnvironment.getPropertySources());
-			resolver.setConversionService(((ConfigurableEnvironment) this.environment).getConversionService());
+			resolver.setConversionService(configurableEnvironment.getConversionService());
 			resolver.setIgnoreUnresolvableNestedPlaceholders(true);
 			return resolver;
 		}