fix nbval tests

[epassaro]

Description

• pin jupyter_client (see: Release 6.1.13 nbconvert failing with TypeError: 'coroutine' object is not subscriptable jupyter/jupyter_client#637)
• disable deprecation warnings on pytest

Motivation and context

Broken tests due a known bug. nbval is starting to be a dependency problem. Maybe it's a good idea for a future gsoc project (reference data tests using pytest-arraydiff as Wolfgang wants for TARDIS).

Before APE 17 migration, all the warnings were disabled via addopts = -p no:warnings in setup.cfg. Now we just filter the deprecation warnings.

How has this been tested?

• Testing pipeline.
• Other.

Examples

Type of change

• Bug fix.
• New feature.
• Breaking change.
• None of the above.

Checklist

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • (optional) I have built the documentation on my fork following the instructions.
• I have assigned and requested two reviewers for this pull request.

[codecov]

Codecov Report

Merging #254 (3327d1a) into master (9f6d308) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #254   +/-   ##
=======================================
  Coverage   74.44%   74.44%           
=======================================
  Files          23       23           
  Lines        2614     2614           
=======================================
  Hits         1946     1946           
  Misses        668      668           

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