Update for Pydantic v2 and anyio v4

[codecov[bot]]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (4c28153) 55.30% compared to head (b75e65a) 55.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #60 +/- ## ========================================== - Coverage 55.30% 55.05% -0.26% ========================================== Files 9 9 Lines 678 683 +5 Branches 157 163 +6 ========================================== + Hits 375 376 +1 - Misses 287 290 +3 - Partials 16 17 +1 ``` | [Files](https://app.codecov.io/gh/dandi/dandisets-healthstatus/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dandi) | Coverage Δ | | |---|---|---| | [code/src/healthstatus/aioutil.py](https://app.codecov.io/gh/dandi/dandisets-healthstatus/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dandi#diff-Y29kZS9zcmMvaGVhbHRoc3RhdHVzL2Fpb3V0aWwucHk=) | `50.00% <0.00%> (ø)` | | | [code/src/healthstatus/tests.py](https://app.codecov.io/gh/dandi/dandisets-healthstatus/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dandi#diff-Y29kZS9zcmMvaGVhbHRoc3RhdHVzL3Rlc3RzLnB5) | `52.00% <50.00%> (ø)` | | | [code/src/healthstatus/core.py](https://app.codecov.io/gh/dandi/dandisets-healthstatus/pull/60?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dandi#diff-Y29kZS9zcmMvaGVhbHRoc3RhdHVzL2NvcmUucHk=) | `72.60% <62.50%> (-1.23%)` | :arrow_down: |

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[yarikoptic]

Thank you! I will pull/restart the process I "manually" run in the screen ATM. @candleindark please review for an example of conversion of pydantic to v2.