Fix HazelcastAutoConfigurationServerTests on Windows

See gh-33687

Author: wilkinsona

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastAutoConfigurationServerTests.java

@@ -156,7 +156,8 @@ private ContextConsumer<AssertableApplicationContext> assertSpecificHazelcastSer
 		return (context) -> {
 			Config config = context.getBean(HazelcastInstance.class).getConfig();
 			String configurationLocation = (config.getConfigurationUrl() != null)
-					? config.getConfigurationUrl().toString() : config.getConfigurationFile().getAbsolutePath();
+					? config.getConfigurationUrl().toString()
+					: config.getConfigurationFile().toURI().toURL().toString();
 			assertThat(configurationLocation).endsWith(location);
 		};
 	}