Auth: improve handling of network and timeout exceptions

https://github.com/microg/GmsCore/pull/3220
Signed-off-by: Cuynu <cuynu@proton.me>

play-services-core/src/main/java/org/microg/gms/auth/loginservice/AccountAuthenticator.java

@@ -104,7 +104,7 @@ class AccountAuthenticator extends AbstractAccountAuthenticator {
             }
         } catch (Exception e) {
             Log.w(TAG, e);
-            return null;
+            throw new NetworkErrorException(e);
         }
         return null;
     }