Update XmLoggingSystem implementation to not to use the deprecated Log4J2LoggingSystem#loadConfiguration method

org.bloomreach.xm.cms.XmLoggingSystem class extends and overrides org.springframework.boot.logging.log4j2.Log4J2LoggingSystem class to parse comma seperated log4j2 configuraton files for OD1 environment.

The method Log4J2LoggingSystem#loadConfiguration(String location, LogFile logFile) which is overrided by XmLogginSystem has been deprecated since spring-boot 2.6.0 hence this method is not called during spring-boot initialization on startup. Eventually the XmLoggingSystem implementation doesn't work anymore and needs to be updated to use Log4J2LoggingSystem#loadConfiguration(String location, LogFile logFile, List<String> overrides) method.