Upgrade to c12 2.x

[stianjensen]

No breaking changes, but a lot of upgraded dependency versions. https://github.com/unjs/c12/blob/main/CHANGELOG.md

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[stianjensen]

Ah, yes. The esmResolve option no longer exists, as ESM resolve has become the only option: https://github.com/unjs/jiti/pull/259/files

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Project coverage is 80.60%. Comparing base (e908593) to head (f69d916). Report is 2 commits behind head on main.

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```diff @@ Coverage Diff @@ ## main #1126 +/- ## ========================================== - Coverage 80.60% 80.60% -0.01% ========================================== Files 107 107 Lines 11735 11732 -3 Branches 1238 1238 ========================================== - Hits 9459 9456 -3 Misses 2273 2273 Partials 3 3 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1126/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1126/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `80.60% <ø> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api#carryforward-flags-in-the-pull-request-comment) to find out more.

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commit: f69d916