Handle when aud OIDC claim is an Array (#4584)
* Handle when `aud` OIDC claim is an Array
The `aud` claim of OIDC id_tokens [can be an array](https://github.com/authts/oidc-client-ts/blob/ce6d694639c58e6a1c80904efdac5eda82b82042/src/Claims.ts#L92) but the existing logic
incorrectly assumes `aud` is always a string.
This PR adds the necessary check.
* Clarify `aud` OIDC claim check
* Fix for prettier
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Co-authored-by: David Baker <dbkr@users.noreply.github.com>
