fix: handle charset in auto parseAs detection

[mrlubos]

Closes https://github.com/hey-api/openapi-ts/issues/1288

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🦋 Changeset detected

Latest commit: 4c853d090b79245854d13831f64731db4a92978b

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

This PR includes changesets to release 7 packages

| Name | Type | | ------------------------------------------------------- | ----- | | @hey-api/client-fetch | Patch | | @example/openapi-ts-fastify | Patch | | @example/openapi-ts-fetch | Patch | | @example/openapi-ts-tanstack-angular-query-experimental | Patch | | @example/openapi-ts-tanstack-react-query | Patch | | @example/openapi-ts-tanstack-svelte-query | Patch | | @example/openapi-ts-tanstack-vue-query | Patch |

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.96%. Comparing base (ee7a411) to head (4c853d0). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1296 +/- ## ======================================= Coverage 66.96% 66.96% ======================================= Files 136 136 Lines 20134 20134 Branches 1791 1791 ======================================= Hits 13482 13482 Misses 6648 6648 Partials 4 4 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1296/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/1296/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `66.96% <ø> (ø)` | | 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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