Revert "Bump vrchat_dart_generated to 1.20.4"

This reverts commit 1288942.

Author: Rexios80

vrchat_dart/pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: ^3.8.0
 
 dependencies:
-  vrchat_dart_generated: ^1.20.4
+  vrchat_dart_generated: ^1.20.0
   dio_cookie_manager: ^3.0.0
   cookie_jar: ^4.0.1
   dio: ^5.2.0