Switch to github.com/mitchellh/hashstructure/v2

[HeavyWombat]

(hopefully) Fixes: #509

Switch to v2.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.83%. Comparing base (5871982) to head (c66e71b).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #622   +/-   ##
=======================================
  Coverage   82.83%   82.83%           
=======================================
  Files          16       16           
  Lines        1823     1823           
=======================================
  Hits         1510     1510           
  Misses        236      236           
  Partials       77       77           

Flag	Coverage Δ
unittests	82.83% <100.00%> (ø)

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