🐛 Source Zendesk Support: fix initially_assigned_at type in ticket metrics

[asyarif93]

What

• close Incorrect type in Zendesk Support (Ticket Metrics) #7376

How

change initially_assigned_at from datetime to date-time format

Recommended reading order

1. ticket_metrics.json

Pre-merge Checklist

Expand the relevant checklist and delete the others.

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• Code reviews completed
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  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
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Airbyter

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[antixar]

Looks fine!