* Upgrade to libpam4j 1.11

* Remove libpam4j from core dependencies

This dependency is no longer used ever since PAM authn/authz support
was extracted into the pam-auth-plugin years ago. This reduces the need
to keep security libraries up to date in multiple places.

* Revert "Remove libpam4j from core dependencies"

This reverts commit a7c7a52a4875b1f6248a4bffb0abd05431b1cbcb.