fix(xo-server): remove password when sign in with provider

Password can no longer be used/edited when an auth provider is registered.

For security concerns, this useless password should be removed from the database.

packages/xo-server/src/xo-mixins/subjects.mjs

@@ -297,6 +297,7 @@ export default class {
             data: data !== undefined ? data : user.authProviders?.[providerId]?.data,
           },
         },
+        password: null,
       })
     }