Fix Jersey test by waiting for metrics

For some reason metrics are not always being recorded before the check
runs when a full build is running. Adding a sleep seems to "solve" the
problem.

See gh-45483
See gh-45404

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/jersey/JerseyServerMetricsAutoConfigurationTests.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.
@@ -82,6 +82,7 @@ class JerseyServerMetricsAutoConfigurationTests {
 	void httpRequestsAreTimed() {
 		this.webContextRunner.run((context) -> {
 			doRequest(context);
+			Thread.sleep(500);
 			MeterRegistry registry = context.getBean(MeterRegistry.class);
 			Timer timer = registry.get("http.server.requests").tag("uri", "/users/{id}").timer();
 			assertThat(timer.count()).isOne();