Added missing nc file

[mikemhenry]

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/.

[mikemhenry]

Saw this when trying to build new conda-forge package https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=783622&view=logs&j=656edd35-690f-5c53-9ba3-09c10d0bea97&t=986b1512-c876-5f92-0d81-ba851554a0a3&l=2798

OSError: $PREFIX/lib/python3.11/site-packages/openfe/tests/data/openmm_rfe/vacuum_nocoord.nc does not exist

[mikemhenry]

Not sure why https://github.com/OpenFreeEnergy/openfe/actions/workflows/package-tests.yaml didn't catch this

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e8da73d) 91.01% compared to head (0aabc32) 91.01%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #562   +/-   ##
=======================================
  Coverage   91.01%   91.01%           
=======================================
  Files         117      117           
  Lines        7220     7220           
=======================================
  Hits         6571     6571           
  Misses        649      649           

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