Revert "Don't use async import"

[kitsuyui]

This reverts commit 4d8e3a0.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 69.98%. Comparing base (fa1e5c1) to head (24e4d6d).

Files	Patch %	Lines
packages/treemap/src/treemap.tsx	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
- Coverage   70.40%   69.98%   -0.42%     
==========================================
  Files          44       44              
  Lines        1500     1509       +9     
  Branches      279      281       +2     
==========================================
  Hits         1056     1056              
- Misses        444      453       +9     

Flag	Coverage Δ
unittests	69.98% <0.00%> (-0.42%)	⬇️

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