Module ldap_sso lost when updating module to the new version
I found the solution,
In the mentioned version of ldap, ldap_sso was removed to a separate project, I proceeded to compare the code in case there was any important difference and the result is that they are the same.

So I proceeded to download:

ldap_sso from https://www.drupal.org/project/ldap_sso/releases/7.x-1.0-beta15 and 

ldap from: https://www.drupal.org/project/ldap/releases/7.x-1.0-beta15 (by suggestion of drupal)

Now these modules go separately and I ran the update and it did not give any problem.

regards