fix: update schemas plugin to handle experimental 3.0.x parser

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🦋 Changeset detected

Latest commit: 08baa77afdc5e2c49d4789b20673e949951ab0b2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------- | ----- | | @hey-api/openapi-ts | Patch |

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Codecov Report

Attention: Patch coverage is 13.15789% with 99 lines in your changes missing coverage. Please review.

Project coverage is 67.79%. Comparing base (448910b) to head (08baa77). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../openapi-ts/src/plugins/@hey-api/schemas/plugin.ts	13.15%	99 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1233 +/- ## ========================================== - Coverage 68.08% 67.79% -0.30% ========================================== Files 132 132 Lines 19242 19342 +100 Branches 1735 1736 +1 ========================================== + Hits 13101 13112 +11 - Misses 6137 6226 +89 Partials 4 4 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1233/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/1233/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `67.79% <13.15%> (-0.30%)` | :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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