Source Mailchimp: correct output schema to handle date-time values

[marcosmarxm]

What

Edit some fields where normalization are failing to cast timestamp with timezone.
Open #5480 to investigate further.

How

Remove date-time type from some fields.

Recommended reading order

1. x.java
2. y.python

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Expand the relevant checklist and delete the others.

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[marcosmarxm]

/test connector=connectors/source-mailchimp

🕑 connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/1141402456
✅ connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/1141402456

[marcosmarxm]

/publish connector=connectors/source-mailchimp

🕑 connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/1141489425
✅ connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/1141489425