fix(message-utils): workaround package.json exports field for older runtimes

[thekip]

Previously, I wrote something non-workable. This time it should work.

Fixes: #1633

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 3:19pm

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	1.43 KB (0%)
./packages/detect-locale/dist/index.mjs	721 B (0%)
./packages/react/dist/index.mjs	1.59 KB (0%)
./packages/remote-loader/dist/index.mjs	7.24 KB (0%)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ba00921) 75.48% compared to head (72b99e1) 75.48%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1657   +/-   ##
=======================================
  Coverage   75.48%   75.48%           
=======================================
  Files          79       79           
  Lines        2011     2011           
  Branches      518      518           
=======================================
  Hits         1518     1518           
  Misses        379      379           
  Partials      114      114           

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