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/request/contact/create.yml

@@ -14,7 +14,8 @@ properties:
     type: string
     description: phone number of the contact
   avatar:
-    type: string <binary>
+    type: string
+    format: binary
     description: Send the form data with the avatar image binary or use the avatar_url
   avatar_url:
     type: string

swagger/definitions/request/contact/update.yml

@@ -10,7 +10,8 @@ properties:
     type: string
     description: phone number of the contact
   avatar:
-    type: string <binary>
+    type: string
+    format: binary
     description: Send the form data with the avatar image binary or use the avatar_url
   avatar_url:
     type: string