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Update `.mailmap` (#7871)

This PR updates the `.mailmap` file to merge some commit authors using
multiple emails.

Release Notes:

- N/A
M
Marshall Bowers committed
6869b62af34fd073b0f4fa45dcece4516f31f9bf
Parent: 21a7421
Committed by GitHub <noreply@github.com> on 2/15/2024, 11:35:43 PM