fix: use pkgUp.sync to localize package.json

[capaj]

This will help detect the correct project type in situations where you want to have multiple lingui configs in a project with a shared package.json.
For example having backend and frontend in separate folders.

I haven't tested this.

[vercel]

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[codecov]

Codecov Report

Merging #985 (a0665f1) into main (77ec0bd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #985   +/-   ##
=======================================
  Coverage   83.30%   83.30%           
=======================================
  Files          53       53           
  Lines        1605     1605           
  Branches      430      430           
=======================================
  Hits         1337     1337           
  Misses        156      156           
  Partials      112      112           

Impacted Files	Coverage Δ
packages/cli/src/api/detect.ts	64.70% <100.00%> (ø)

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