fix: transform any-of nullable dates

[mrlubos]

Closes https://github.com/hey-api/openapi-ts/issues/986

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Latest commit: e8a38ae4e3f021a105d18764ef3252db7efa9aa0

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

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Codecov Report

Attention: Patch coverage is 31.13208% with 73 lines in your changes missing coverage. Please review.

Project coverage is 76.47%. Comparing base (2228914) to head (e8a38ae). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/openapi-ts/src/compiler/types.ts	8.10%	34 Missing :warning:
packages/openapi-ts/src/compiler/transform.ts	22.58%	24 Missing :warning:
packages/openapi-ts/src/generate/transformers.ts	6.66%	14 Missing :warning:
packages/openapi-ts/src/utils/type.ts	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1066 +/- ## ========================================== - Coverage 76.66% 76.47% -0.20% ========================================== Files 103 103 Lines 11280 11323 +43 Branches 1135 1134 -1 ========================================== + Hits 8648 8659 +11 - Misses 2628 2660 +32 Partials 4 4 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1066/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/1066/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `76.47% <31.13%> (-0.20%)` | :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: e8a38ae