build(deps): remove iso8601 dep

[brainbicycle]

This PR resolves []

Description

Removes iso8601 dep specified in podfile, there is a date formatter now built in foundation for the same purpose. We are still pulling in this dep as a transitive dep from Aerodramus but this gets us closer to getting rid of it.

Worth some focused testing! Live auctions and some api calls depend on this functionality! Draft until I do some testing :)

PR Checklist

• [ ] I have tested my changes on iOS and Android.
• [x] I hid my changes behind a feature flag, or they don't need one.
• [x] I have included screenshots or videos, or I have not changed the UI.
• [x] I have added tests, or my changes don't require any.
• [x] I added an app state migration, or my changes do not require one.
• [x] I have documented any follow-up work that this PR will require, or it does not require any.
• [x] I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• [ ] I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

iOS user-facing changes

Android user-facing changes

Dev changes

• Remove iso8601 dep - Brian

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[ArtsyOpenSource]

This PR contains the following changes:

• Dev changes (Remove iso8601 dep - Brian)

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