Bump LDAP version on README

Author: williamdes

README.md

@@ -1,6 +1,6 @@
 # A Docker image for [OpenLDAP](https://www.openldap.org/)
 
-Based on Alpine `3.16`. Using [OpenLDAP](https://git.openldap.org/openldap/openldap) version: `2.6.2`
+Based on Alpine `3.16`. Using [OpenLDAP](https://git.openldap.org/openldap/openldap) version: `2.6.3`
 
 Can be found on [Docker Hub](https://hub.docker.com/r/botsudo/docker-openldap)