Bump log4j-api in /tutorials/oauth/java/appsecret/producer

Bumps log4j-api from 2.6.1 to 2.16.0.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-api
  dependency-type: direct:production
...

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tutorials/oauth/java/appsecret/producer/pom.xml

@@ -27,7 +27,7 @@
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
-      <version>2.6.1</version>
+      <version>2.16.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>