Skip pyjags tests

[ahartikainen]

Description

Checklist

• Follows official PR format
• Includes a sample plot to visually illustrate the changes (only for plot-related functions)
• New features are properly documented (with an example if appropriate)?
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

[codecov]

Codecov Report

Merging #1963 (28e29d8) into main (17b1a48) will increase coverage by 11.34%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1963       +/-   ##
===========================================
+ Coverage   79.56%   90.90%   +11.34%     
===========================================
  Files         113      113               
  Lines       12217    12217               
===========================================
+ Hits         9720    11106     +1386     
+ Misses       2497     1111     -1386     

Impacted Files	Coverage Δ
arviz/utils.py	88.23% <0.00%> (+0.65%)	⬆️
arviz/data/base.py	98.21% <0.00%> (+5.95%)	⬆️
arviz/data/io_pymc3.py	73.33% <0.00%> (+6.66%)	⬆️
arviz/data/io_cmdstan.py	89.49% <0.00%> (+40.48%)	⬆️
arviz/data/io_numpyro.py	93.89% <0.00%> (+67.17%)	⬆️
arviz/data/io_pyro.py	96.24% <0.00%> (+68.42%)	⬆️
arviz/data/io_pymc3_3x.py	90.23% <0.00%> (+72.05%)	⬆️
arviz/data/io_cmdstanpy.py	93.75% <0.00%> (+78.12%)	⬆️
arviz/data/io_pystan.py	96.09% <0.00%> (+81.97%)	⬆️
arviz/data/io_emcee.py	98.34% <0.00%> (+85.95%)	⬆️

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