build(deps): bump log4j-api in /example/HelloWorldFunction

Bumps log4j-api from 2.13.2 to 2.15.0.

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

example/HelloWorldFunction/pom.xml

@@ -9,7 +9,7 @@
     <properties>
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
-        <log4j.version>2.13.2</log4j.version>
+        <log4j.version>2.15.0</log4j.version>
     </properties>
 
     <dependencies>