Helium

Thank you Jo-Blade for the [PR](https://github.com/mherrmann/helium/pull/132)!

See https://github.com/mherrmann/helium/commit/2100561745de5236b585665ef8ed1271d8c0d771.

This is a minor version upgrade (5.0.... -> 5.1....) because the new implementation may find slightly different text fields.

It was introduced in v5.0.5.

Please see the newly added test for details.

It sometimes happened. Now, `wait_until(...)` handles this error gracefully by just waiting a little more.