fix: use file urls when calling import()

[SimenB]

Summary

Fixes #9544.

Test plan

I've tested this on windows. We have an integration test for this, but we only run windows CI with node v12...

EDIT: As can be seen in #9540, this was failing for node 13 on windows, but now passing

[codecov-io]

Codecov Report

Merging #9558 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #9558   +/-   ##
=======================================
  Coverage   65.04%   65.04%           
=======================================
  Files         286      286           
  Lines       12123    12123           
  Branches     3004     3004           
=======================================
  Hits         7885     7885           
  Misses       3600     3600           
  Partials      638      638

Impacted Files	Coverage Δ
packages/jest-config/src/importMjs.ts	0% <0%> (ø)	⬆️

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[github-actions]

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