make HOHQMesh only a test dependency

[ranocha]

I guess HOHQMesh was accidentally committed as direct dependency but never used outside of tests.

[codecov[bot]]

Codecov Report

Merging #118 (1ee6fa8) into main (8239f0e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #118   +/-   ##
=======================================
  Coverage   97.24%   97.24%           
=======================================
  Files          25       25           
  Lines        2758     2758           
=======================================
  Hits         2682     2682           
  Misses         76       76           

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[jlchan]

Ah! Good catch. Thanks