UvA DL Tutorials: Update API to PL 1.8

[phlippe]

What does this PR do?

In the UvA DL Tutorial 8 (Deep Autoencoder), the generation callback used a deprecated and now removed API of on_epoch_end. This pull request updates it to on_train_epoch_end to be compatible with the new PL 1.8 version.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #210 (c6337ce) into main (5419bb2) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

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[Borda]

@phlippe seems we have finally fixed the ci/cd and so we are fine to proceed... 🐰

[Borda]

btw, shall we in such a case also bump the min version? 🦦

[phlippe]

Thanks @Borda for fixing the CI and merging the pull request!
Pushing up the minimum version sounds good, I noticed that the notebooks are still using progress_bar_refresh_rate which also became deprecated lately in Lightning. I will send another pull request with this update, then all notebooks should run smoothly with the newest Lightning version

[Borda]

@phlippe shall we bump all classes to use PL 1.8 as minimal version? What do you think?

[phlippe]

Yes, agreed, there have been a few API changes since 1.4 which would be good to enforce with 1.8 (e.g. accelerator selection and progress bar). I think we may have to merge #222 beforehand though