Address unnecessary method invocation

Closes gh-15714

config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java

@@ -628,7 +628,7 @@ public abstract class AbstractRequestMatcherRegistry<C> {
 		public boolean matches(HttpServletRequest request) {
 			String name = request.getHttpServletMapping().getServletName();
 			ServletRegistration registration = this.servletContext.getServletRegistration(name);
-			Assert.notNull(registration, computeErrorMessage(this.servletContext.getServletRegistrations().values()));
+			Assert.notNull(registration, () -> computeErrorMessage(this.servletContext.getServletRegistrations().values()));
 			try {
 				Class<?> clazz = Class.forName(registration.getClassName());
 				return DispatcherServlet.class.isAssignableFrom(clazz);