Updated apps and engines

- Updated tk-multi-loader2 to v1.19.6
Release Notes: https://github.com/shotgunsoftware/tk-multi-loader2/wiki/Release-notes#v1196

- Updated tk-maya to v0.9.10
Release Notes: https://github.com/shotgunsoftware/tk-maya/wiki/Release-Notes#v0910

- Updated tk-desktop to v2.4.13
Release Notes: https://github.com/shotgunsoftware/tk-desktop/wiki/Release-Notes#v2413

Author: mathurf

env/includes/common/apps.yml

@@ -45,7 +45,7 @@ common.apps.tk-multi-publish2.location:
 common.apps.tk-multi-loader2.location:
   type: app_store
   name: tk-multi-loader2
-  version: v1.19.5
+  version: v1.19.6
 
 common.apps.tk-multi-shotgunpanel.location:
   type: app_store

env/includes/common/engines.yml

@@ -33,7 +33,7 @@ common.engines.tk-houdini.location:
 common.engines.tk-maya.location:
   type: app_store
   name: tk-maya
-  version: v0.9.9
+  version: v0.9.10
 
 # Nuke
 common.engines.tk-nuke.location:
@@ -75,7 +75,7 @@ common.engines.tk-vred.location:
 common.engines.tk-desktop.location:
   type: app_store
   name: tk-desktop
-  version: v2.4.12
+  version: v2.4.13
 
 # Desktop2
 common.engines.tk-desktop2.location: