feat: upgrade to Shorthand v2.1.0

[danielgtaylor]

Bumps mexpr to 1.8.0 as well, which includes a new where clause for maps and several fixes.

[codecov]

Codecov Report

Merging #164 (36ecd2a) into main (2a9db11) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   74.71%   74.71%           
=======================================
  Files          25       25           
  Lines        3385     3385           
=======================================
  Hits         2529     2529           
  Misses        659      659           
  Partials      197      197           

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