chore: Cleanup: Removes old log4j values and file left over (#1486)

fixes #1031, which has some of the investigation confirming this was
really left over and now unused

Author: lisad

distributions/demo-server/src/main/resources/log4j.properties

@@ -38,7 +38,6 @@ okHttpVersion=3.9.1
 azureKeyVaultVersion=1.0.0
 javaDockerContainer=openjdk:11
 jerseyVersion=2.26
-log4jVersion=2.17.0
 apacheHttpVersion=4.5.6
 
 # ossrhUsername=