fix: support CSS variables

[gregberge]

Fixes #582

[vercel]

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[codecov]

Codecov Report

Merging #627 (cbdb47f) into main (985444d) will increase coverage by 3.41%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #627      +/-   ##
==========================================
+ Coverage   89.20%   92.61%   +3.41%     
==========================================
  Files          32       32              
  Lines         713      718       +5     
  Branches      232      233       +1     
==========================================
+ Hits          636      665      +29     
+ Misses         76       52      -24     
  Partials        1        1              

Impacted Files	Coverage Δ
.../hast-util-to-babel-ast/src/stringToObjectStyle.ts	96.66% <100.00%> (+80.66%)	⬆️
...ckages/hast-util-to-babel-ast/src/getAttributes.ts	91.42% <0.00%> (+2.85%)	⬆️
packages/hast-util-to-babel-ast/src/util.ts	92.85% <0.00%> (+21.42%)	⬆️

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