Update authLdap to 2.3.1

Dockerfile

@@ -20,7 +20,7 @@ RUN chmod +x /app/code/wp
 RUN /bin/echo -e "apache_modules:\n  - mod_rewrite" > /app/code/wp-cli.yml
 
 # Get the plugins
-RUN curl -L -o /app/code/authLdap.zip https://github.com/heiglandreas/authLdap/archive/2.1.2.zip
+RUN curl -L -o /app/code/authLdap.zip https://github.com/heiglandreas/authLdap/archive/2.3.1.zip
 # https://plugins.svn.wordpress.org/disable-wordpress-core-update/
 RUN curl -L -o /app/code/disable-wordpress-core-update.zip https://downloads.wordpress.org/plugin/disable-wordpress-core-update.zip
 # https://plugins.svn.wordpress.org/wp-mail-smtp/