Replace use of java.util.Optional with tenary operator in DelegatingAppender.getAppender() method.

spring-geode-starter-logging/src/main/java/org/springframework/geode/logging/slf4j/logback/DelegatingAppender.java

@@ -62,7 +62,12 @@ public class DelegatingAppender<T> extends AppenderBase<T> {
 
 	@SuppressWarnings("unchecked")
 	protected Appender<T> getAppender() {
-		return Optional.ofNullable(this.appender).orElse(DEFAULT_APPENDER);
+
+		Appender<T> configuredAppender = this.appender;
+
+		return configuredAppender != null
+			? configuredAppender
+			: DEFAULT_APPENDER;
 	}
 
 	@Override