Upgrade Play! to 1.4.6 (see openseedbox/openseedbox#77)

Fix for:

~ *****************************************************************************
~
~ WARNING: These dependencies are missing, your application may not work properly (use --verbose for details),
~
~
~
~ play->play [1.3.4,1.4[
~
~ play->play [1.3.4,1.4[: not found
~
~ *****************************************************************************
~
~ Some dependencies are still missing.

See openseedbox/openseedbox@2b39836
See openseedbox/openseedbox@da14420

conf/dependencies.yml

@@ -1,7 +1,7 @@
 # Application dependencies
 
 require:
-    - play [1.3.4,1.4[
+    - play [1.3.4,1.5[
     - openseedbox-common -> openseedbox-common latest.integration
     - com.turn -> ttorrent-core 1.5:
        transitive: false