pin rpds-py so pypy 3.10 tests pass

[asmacdo]

rpds-py is a dependency of jsonschema, which is a dependency of pyout, which is optional.

rpds-py dropped pypy3.10 support last week.

Fixes #330

[mergify]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.34%. Comparing base (427ab91) to head (47f9162).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #331   +/-   ##
=======================================
  Coverage   91.34%   91.34%           
=======================================
  Files           7        7           
  Lines         947      947           
  Branches      125      125           
=======================================
  Hits          865      865           
  Misses         59       59           
  Partials       23       23           

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[yarikoptic]

there must be a way to limit to pypy

[yarikoptic]

and add comment on why we need it here

[yarikoptic]

didn't check but spotted in https://github.com/con/duct/pull/325/files#diff-fa602a8a75dc9dcc92261bac5f533c2a85e34fcceaff63b3a3a81d9acde2fc52R63

Suggested change

	rpds-py<0.28.0
	rpds-py<0.28.0; implementation_name == "pypy"