Fix notebooks for new RavenPy

[Zeitsperre]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• (If applicable) Documentation has been added / updated (for bug fixes / features).
• (If applicable) Tests have been added.
• CHANGELOG.rst has been updated (with summary of main changes).
  • Link to issue (:issue:number) and pull request (:pull:number) has been added.

What kind of change does this PR introduce?

• Updates the notebooks and re-runs all of them to esnure they are working with latest libraries
• Adds a few missing testing data files to the pooch registry

Does this PR introduce a breaking change?

Yes. Testing data was added to the registry.txt so a new version of RavenPy is needed on PAVICS.

Other information:

We don't currently run the notebooks here in CI, as a few of them take far too long to compute. Perhaps we need to add a build for this regardless.

Changes here required for: Ouranosinc/PAVICS-e2e-workflow-tests#150

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[coveralls]

coverage: 80.752%. remained the same
when pulling 4af00fc on fix-notebooks
into b4c77c2 on master.