Remove duplicate line in environment.yml

[CurtisColwell]

Was in here again yesterday and noticed an extra line.

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[IAlibay]

Thanks @CurtisColwell !

The failures are something else that @atravitz is trying to fix elsewhere. We'll probably have to wait until that's fixed before we resume merging PRs.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.64%. Comparing base (907cdfd) to head (493295c).
⚠️ Report is 275 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1280      +/-   ##
==========================================
- Coverage   92.73%   91.64%   -1.09%     
==========================================
  Files         141      141              
  Lines       10855    10855              
==========================================
- Hits        10066     9948     -118     
- Misses        789      907     +118     

Flag	Coverage Δ
fast-tests	91.64% <ø> (-1.09%)	⬇️

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