fix: default to known refresh token on Google refresh

src/Two/GoogleProvider.php

@@ -59,6 +59,21 @@ protected function getUserByToken($token)
         return json_decode($response->getBody(), true);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function refreshToken($refreshToken)
+    {
+        $response = $this->getRefreshTokenResponse($refreshToken);
+
+        return new Token(
+            Arr::get($response, 'access_token'),
+            Arr::get($response, 'refresh_token', $refreshToken),
+            Arr::get($response, 'expires_in'),
+            explode($this->scopeSeparator, Arr::get($response, 'scope', ''))
+        );
+    }
+
     /**
      * {@inheritdoc}
      */