Bump assert_cmd & fix deprecation warnings

[cakebaker]

This PR bumps assert_cmd from 2.0.17 to 2.1.02.1.1 and replaces the deprecated Command::cargo_bin with cargo_bin_cmd!.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.88%. Comparing base (f988293) to head (120ff52).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #587   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files          31       31           
  Lines        6300     6300           
  Branches      324      324           
=======================================
  Hits         5600     5600           
  Misses        578      578           
  Partials      122      122           

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[cakebaker]

Changes since last push:

• rebased
• bumped assert_cmd from 2.1.0 to 2.1.1