Use any instead of interface{} (#20577)

* replace interface{} with any

model/message_export.go

@@ -40,7 +40,7 @@ type MessageExportCursor struct {
 // PreviewID returns the value of the post's previewed_post prop, if present, or an empty string.
 func (m *MessageExport) PreviewID() string {
 	var previewID string
-	props := map[string]interface{}{}
+	props := map[string]any{}
 	if m.PostProps != nil && json.Unmarshal([]byte(*m.PostProps), &props) == nil {
 		if val, ok := props[PostPropsPreviewedPost]; ok {
 			previewID = val.(string)