Replace `DioError` to `DioException`

[marandaneto]

Description

Right now files are annotated with deprecated_member_use due to Dio's breaking change.
DioError still exists and is back-compatible, at some point may be removed.

[kuhnroyal]

We have removed DioError in the 6.0.0 branch - see cfug/dio#1825
So at some point in the future sentry_dio needs a breaking change as well.

[marandaneto]

Thanks for the heads up.