chore: deploy v2.9.4 in eu-west-3 idx 0 (#979)

Author: v0idpwn

deploy/upgrade/prod.config

@@ -4,7 +4,7 @@
     {upgrade_to, "2.9.4"},
     % list() | [<<"all">>]
     {regions, [
-	    <<"cac11">>
+	    <<"eu-west-3">>
             ]},
     % :soft | :hard
     {type, soft}