Bump log4j-api from 2.15.0 to 2.16.0 in /bootstrap/standalone (#2700)

Bumps log4j-api from 2.15.0 to 2.16.0.

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

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bootstrap/standalone/pom.xml

@@ -11,7 +11,7 @@
     <artifactId>bootstrap-standalone</artifactId>
 
     <properties>
-        <log4j.version>2.15.0</log4j.version>
+        <log4j.version>2.16.0</log4j.version>
     </properties>
 
     <dependencies>