Add new entry to .mailmap

[JaclynCodes]

This pull request adds a new entry to the .mailmap file to improve author mapping for future contributions.

• Author mapping:
  • Added a mapping for JaclynCodes with the email address <dev.Jaclyn.Codes@gmail.com> to the .mailmap file.<!---
    Thank you for your soon to be pull request. Before you submit this, please
    double check to make sure that you've added a news file fragment. In pip we
    generate our NEWS.rst from multiple news fragment files, and all pull requests
    require either a news file fragment or a marker to indicate they don't require
    one.

To read more about adding a news file fragment for your PR, please check out
our documentation at: https://pip.pypa.io/en/latest/development/contributing/#news-entries
-->

[Copilot]

Pull request overview

This PR adds a new entry to the .mailmap file to map author information for JaclynCodes with the email address dev.Jaclyn.Codes@gmail.com. However, the entry is incorrectly formatted across two separate lines instead of following the standard single-line format used throughout the file.

Key Changes:

• Adds a new author mapping entry for JaclynCodes to the .mailmap file

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[notatallshaw]

Please don't open a PR and add new workflows without discussing it with the maintainers first in an issue.

If you need a mail mapping entry for a future PR you can add it in that PR, or after that PR.