physlock: 0.5 -> 11-dev

Update physlock to a more current version which supports PAM and
systemd-logind.  Amongst others, this should work now with the slim
login manager without any additional configuration, because it does
not rely on the utmp mechanism anymore.

nixos/modules/services/security/physlock.nix

@@ -99,6 +99,8 @@ in
       '';
     };
 
+    security.pam.services.physlock = {};
+
   };
 
 }