Port types codegen to yaml.v3

v3 threats empty defs a bit differently (see changes in yaml files)

compose/types/types.yaml

@@ -1,7 +1,7 @@
 types:
   Namespace:
     labelResourceType: compose:namespace
-  Attachment:
+  Attachment: {}
   Module:
     labelResourceType: compose:module
   ModuleField:

messaging/types/types.yaml

@@ -1,9 +1,9 @@
 types:
-  Attachment:
-  Mention:
-  MessageFlag:
-  Message:
-  Channel:
+  Attachment: {}
+  Mention: {}
+  MessageFlag: {}
+  Message: {}
+  Channel: {}
   ChannelMember:
     noIdField: true
   Command:

pkg/actionlog/types.yaml

@@ -1,3 +1,3 @@
 package: actionlog
 types:
-  Action:
+  Action: {}

pkg/codegen/types.go

@@ -2,7 +2,7 @@ package codegen
 
 import (
 	"fmt"
-	"gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 	"os"
 	"path"
 	"syscall"

system/types/types.yaml

@@ -7,8 +7,8 @@ types:
     labelResourceType: role
   RoleMember:
     noIdField: true
-  Credentials:
-  Reminder:
-  Attachment:
+  Credentials: {}
+  Reminder: {}
+  Attachment: {}
   SettingValue:
     noIdField: true