Polish "Harmonize Otlp*Configurations"

See gh-45643

Author: snicoll

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/otlp/OtlpTracingConfigurations.java

@@ -37,7 +37,7 @@
  * @author Moritz Halbritter
  * @author Eddú Meléndez
  */
-class OtlpTracingConfigurations {
+final class OtlpTracingConfigurations {
 
 	@Configuration(proxyBeanMethods = false)
 	static class ConnectionDetails {