chore: remove design-system from helper deps

[joshuaellis]

What does it do?

• removes @strapi/design-system from the helper plugin deps

Why is it needed?

• Because I accidentally introduced it in e84eb50 when I should have updated the devDeps

[codecov]

Codecov Report

Base: 58.76% // Head: 58.76% // No change to project coverage 👍

Coverage data is based on head (ab535e8) compared to base (2a4d0ca).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14679   +/-   ##
=======================================
  Coverage   58.76%   58.76%           
=======================================
  Files        1322     1322           
  Lines       32042    32042           
  Branches     5987     5987           
=======================================
  Hits        18829    18829           
  Misses      11351    11351           
  Partials     1862     1862           

Flag	Coverage Δ
front	62.47% <ø> (ø)
unit	50.20% <ø> (ø)

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