Fix missing regex var allowed_deserialization_classes

[codecov[bot]]

Codecov Report

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

Project coverage is 90.09%. Comparing base (02f7a89) to head (e1d0b4f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2126 +/- ## ========================================== - Coverage 90.99% 90.09% -0.91% ========================================== Files 75 75 Lines 4322 4322 Branches 539 539 ========================================== - Hits 3933 3894 -39 - Misses 291 323 +32 - Partials 98 105 +7 ``` | [Flag](https://app.codecov.io/gh/astronomer/astro-sdk/pull/2126/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=astronomer) | Coverage Δ | | |---|---|---| | [PythonSDK](https://app.codecov.io/gh/astronomer/astro-sdk/pull/2126/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=astronomer) | `90.09% <ø> (-0.91%)` | :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=astronomer#carryforward-flags-in-the-pull-request-comment) to find out more.

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