feat: update Yahoo OAuth provider

src/Appwrite/Auth/OAuth2/Yahoo.php

@@ -164,13 +164,17 @@ class Yahoo extends OAuth2
     /**
      * Check if the OAuth email is verified
      * 
+     * If present, the email is verified. This was verfied through a manual Yahoo sign up process
+     * 
      * @param $accessToken
      * 
      * @return bool
      */
     public function isEmailVerified(string $accessToken): bool
     {
-        return false;
+        $email = $this->getUserEmail($accessToken);
+
+        return !empty($email);
     }
 
     /**