chore: Update imports to new location for Dropdown

[bmartel]

Updating leftover imports to new location in UI lib.

All dropdowns are building and working correctly:

[netlify]

✅ Deploy Preview for label-studio-docs-new-theme canceled.

Name	Link
🔨 Latest commit	7924b2f
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-docs-new-theme/deploys/692056b951c8c30008391df9

[netlify]

✅ Deploy Preview for label-studio-storybook ready!

Name	Link
🔨 Latest commit	7924b2f
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-storybook/deploys/692056b969993400082bb3ed
😎 Deploy Preview	https://deploy-preview-8861--label-studio-storybook.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for heartex-docs canceled.

Name	Link
🔨 Latest commit	7924b2f
🔍 Latest deploy log	https://app.netlify.com/projects/heartex-docs/deploys/692056b9761aa50008147040

[netlify]

✅ Deploy Preview for label-studio-playground ready!

Name	Link
🔨 Latest commit	7924b2f
🔍 Latest deploy log	https://app.netlify.com/projects/label-studio-playground/deploys/692056b96e100500083b5df2
😎 Deploy Preview	https://deploy-preview-8861--label-studio-playground.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.45%. Comparing base (007af00) to head (7924b2f).
⚠️ Report is 1 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (007af00) and HEAD (7924b2f). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (007af00)	HEAD (7924b2f)
pytests	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8861      +/-   ##
===========================================
- Coverage    66.73%   58.45%   -8.29%     
===========================================
  Files          812      554     -258     
  Lines        63804    40287   -23517     
  Branches     10790    10790              
===========================================
- Hits         42580    23548   -19032     
+ Misses       21220    16735    -4485     
  Partials         4        4              

Flag	Coverage Δ
lsf-e2e	52.42% <ø> (-0.01%)	⬇️
lsf-integration	49.14% <ø> (+0.03%)	⬆️
lsf-unit	8.35% <ø> (ø)
pytests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.