Bump log4j.version from 2.12.1 to 2.13.3 in /flink-code-java-0421

Bumps `log4j.version` from 2.12.1 to 2.13.3.

Updates `log4j-slf4j-impl` from 2.12.1 to 2.13.3

Updates `log4j-api` from 2.12.1 to 2.13.3

Updates `log4j-core` from 2.12.1 to 2.13.3

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

Author: dependabot[bot]

flink-code-java-0421/pom.xml

@@ -34,7 +34,7 @@ under the License.
 		<scala.binary.version>2.11</scala.binary.version>
 		<maven.compiler.source>${java.version}</maven.compiler.source>
 		<maven.compiler.target>${java.version}</maven.compiler.target>
-		<log4j.version>2.12.1</log4j.version>
+		<log4j.version>2.13.3</log4j.version>
 	</properties>
 
 	<repositories>