chore: pin mypy and pyright versions

[justindujardin]

• it's a bummer getting small PRs with busted builds. We can update the versions manually if needed.

[codecov[bot]]

Codecov Report

Merging #84 (676413d) into master (ef84745) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #84   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines         1029      1029           
=========================================
  Hits          1029      1029           

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[github-actions[bot]]

:tada: This PR is included in version 0.6.2 :tada:

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