fix: use correct require extension to load config

[bluwy]

Description

Fix #9112

Check in _require.extensions for .ts added by ts-node before falling back to .js.

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[bluwy]

My bad. Had to force-push. Committed to the wrong branch.

[haoqunjiang]

Cool!
I was thinking about hard-coding .ts extension here, but this is definitely a better solution.

[sapphi-red]

tested with \.[cm][jt]s and it worked 👍

[patak-dev]

Looks good, @bluwy could you resolve the conflicts, let's get this one before the next patch 👍🏼

[bluwy]

Resolved 👍