fix: add support for OpenAPI 3.1.1 to experimental parser

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🦋 Changeset detected

Latest commit: 3a80b9fd009c8229d69f3f349acbfb19b7549a94

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 77.27273% with 10 lines in your changes missing coverage. Please review.

Project coverage is 73.11%. Comparing base (8322b39) to head (3a80b9f). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../openapi-ts/src/plugins/@hey-api/schemas/plugin.ts	66.66%	7 Missing :warning:
...kages/openapi-ts/src/openApi/3.0.x/parser/index.ts	57.14%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1209 +/- ## ========================================== + Coverage 73.09% 73.11% +0.01% ========================================== Files 125 125 Lines 17617 17634 +17 Branches 1715 1726 +11 ========================================== + Hits 12878 12893 +15 - Misses 4736 4738 +2 Partials 3 3 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1209/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/1209/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `73.11% <77.27%> (+0.01%)` | :arrow_up: | 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: 3a80b9f