Fix unit test breakage from smargon limit enforcement changes in dodal

[rtuck99]

Fixes further breakage to unit tests from

• Ophyd async motor limit check in smargon dodal#1511

(remember to update pyproject.toml with the dodal commit tag if you need it for tests to pass!)

Instructions to reviewer on how to test:

1. Unit tests pass

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (16bc12e) to head (3e8666b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1264   +/-   ##
=======================================
  Coverage   89.74%   89.74%           
=======================================
  Files         128      128           
  Lines        7925     7925           
=======================================
  Hits         7112     7112           
  Misses        813      813           

Components	Coverage Δ
i24 SSX	75.60% <ø> (ø)
hyperion	97.72% <ø> (ø)
other	97.96% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[olliesilvester]

Thanks!