lock version to 2.41.0 due to a bug in 2.42.0

selenium-standalone-server 2.42.0 has a bug where in some situations retriving the `value` of an element fails with an empty error message.

```
Error: GET /session/1755bed5-aa4f-4819-8d0c-a16e03c4ad7f/element/36/value
Build info: version: '2.42.0', revision: '5e82430', ...
```