swagger: fixed invalid specification (#5485)

Currently, the swagger spec doesn't follow the Swagger 2.0 specification. So, I facing 4 errors when trying generate the Golang client for chatwoot.
Due to the spec, the binary field should use format: binary beside type: string

Signed-off-by: Giau. Tran Minh <hello@giautm.dev>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

swagger/definitions/resource/extension/conversation/show.yml

@@ -1,5 +1,4 @@
 type: object
 allOf:
-  - $ref: '#/definitions/generic_id'
   - $ref: '#/definitions/conversation'
   - $ref: '../contact/conversation.yml'

swagger/definitions/resource/extension/message/with_source_sender.yml

@@ -2,5 +2,3 @@ type: object
 properties:
   source_id:
     type: number
-  sender:
-    type: object