Remove unused log4j dependency

Remove log4j from parent management as it is no longer used. This will resolve the following security vulnerabilities:

1. https://github.com/graphfoundation/ongdb/security/dependabot/28
2. https://github.com/graphfoundation/ongdb/security/dependabot/27
3. https://github.com/graphfoundation/ongdb/security/dependabot/26
4. https://github.com/graphfoundation/ongdb/security/dependabot/1