fix: add dependencies for tutorial tests; fix pymc errors.

[janfb]

We need the notebook dependencies during testing because we execute all notebooks during CI test.

• add notebook dependency to test group via notebook group.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1716   +/-   ##
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  Coverage        ?   88.50%           
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  Files           ?      137           
  Lines           ?    11493           
  Branches        ?        0           
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  Hits            ?    10172           
  Misses          ?     1321           
  Partials        ?        0           

Flag	Coverage Δ
unittests	88.50% <100.00%> (?)

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Files with missing lines	Coverage Δ
sbi/inference/posteriors/mcmc_posterior.py	84.05% <ø> (ø)
sbi/samplers/mcmc/pymc_wrapper.py	88.40% <100.00%> (ø)

[janfb]

CD is still failing, at least two problems:

• we need the nbformat dep, not necessarily the full notebook dep
• the z-scoring PR has introduced NaN issues in the slow tests

[janfb]

CD was still failing with pymc errors for python versions >3.10 (see also #1697). This is now fixed (once and for all I hope) by squeezing the energy / likelihood output needed for NUTS / HMC before passing it to pymc.

[janfb]

Both CI and CD are passing now on all version, merging..