ci: Disable PyPy tests for now

[rht]

No description provided.

[codecov]

Codecov Report

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@@            Coverage Diff            @@
##             master      #56   +/-   ##
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  Coverage          ?   58.88%           
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  Files             ?        5           
  Lines             ?      180           
  Branches          ?        0           
=========================================
  Hits              ?      106           
  Misses            ?       74           
  Partials          ?        0           

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[wang-boyu]

LGTM (can't approve or merge though).