chore(deps): bump org.apache.logging.log4j:log4j-core in /demo

Bumps org.apache.logging.log4j:log4j-core from 2.25.3 to 2.25.4.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-version: 2.25.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

demo/pom.xml

@@ -17,7 +17,7 @@
         <maven.javadoc.skip>true</maven.javadoc.skip>
         <maven.deploy.skip>true</maven.deploy.skip>
 
-        <log4j.version>2.25.3</log4j.version>
+        <log4j.version>2.25.4</log4j.version>
     </properties>
 
     <artifactId>easysql-demo</artifactId>