Prep for release (2.4.56)

CHANGES

 OpenLDAP 2.4 Change Log
 
-OpenLDAP 2.4.56 Engineering
+OpenLDAP 2.4.56 Release (2020/11/10)
 	Fixed slapd to remove assert in certificateListValidate (ITS#9383)
 	Fixed slapd to remove assert in csnNormalize23 (ITS#9384)
 	Fixed slapd to better parse ldapi listener URIs (ITS#9379)

build/version.var

@@ -15,9 +15,9 @@
 ol_package=OpenLDAP
 ol_major=2
 ol_minor=4
-ol_patch=X
-ol_api_inc=20455
+ol_patch=56
+ol_api_inc=20456
 ol_api_current=13
-ol_api_revision=3
+ol_api_revision=4
 ol_api_age=11
-ol_release_date="2020/10/26"
+ol_release_date="2020/11/10"