add attrs explicit dependency

[shcheklein]

fixes AttrsInstance import failing on older versions of attrs, fixed by python-attrs/attrs#987

TODO:

• Update conda package.
• Do we update other places (other packages in some way)?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.67%. Comparing base (a80d224) to head (615ee06).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10354   +/-   ##
=======================================
  Coverage   90.67%   90.67%           
=======================================
  Files         500      500           
  Lines       38696    38696           
  Branches     5600     5600           
=======================================
  Hits        35088    35088           
  Misses       2961     2961           
  Partials      647      647           

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[shcheklein]

@skshetry

• Update conda package.
• Do we update other places (other packages in some way)?

what is the policy about those?

[skshetry]

We can update the conda package today without waiting for a new release (we need to add attrs as a dependency and increment the build number). But AttrsInstance is only used in ds command which is not released yet, so it's not urgent. But we don't actively update conda packages, as most users will get new versions of dependency anyway (we haven't had any complaints so far).

There are no other places that we need to add.