🧪 TESTS: Skip failing rinohtype tests

[foster999]

I can't reproduce or identify the source of this test's failure below Python v3.8.

Skipping these tests on versions below 3.8 will allow us to release until #123 is resolved.

[codecov]

Codecov Report

Merging #124 (bedb905) into master (69f31ff) will decrease coverage by 4.61%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   97.16%   92.55%   -4.62%     
==========================================
  Files           2        2              
  Lines         212      215       +3     
==========================================
- Hits          206      199       -7     
- Misses          6       16      +10     

Flag	Coverage Δ
pytests	92.55% <83.33%> (-4.62%)	⬇️

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Impacted Files	Coverage Δ
sphinx_tabs/tabs.py	92.48% <83.33%> (-4.66%)	⬇️

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[foster999]

@Daltz333, would you be happy for this to go in so that #117 can be released?

I'm happy to wait until this can be fixed properly, but not sure when I'll have a chance to take a deeper look