fix: Add dy.Object to mypy plugin

[delsner]

Motivation

We forgot to add dy.Object to the mypy plugin in #11.

Changes

Add dy.Object to mypy plugin.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4e965d3) to head (f51f21e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #29   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        37           
  Lines         1808      1808           
=========================================
  Hits          1808      1808           

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[borchero]

Thanks! We'll probably need to think about the mypy plugin in #27 as well.