[python-ldap] Renamed master branch to main branch

[Simon Pichugin]

Hello,
As part of the conscious language effort, the master branch has been
renamed to the main branch.

For those affected by this, please update your local source code
repositories by running the following commands:

    git branch -m master main
    git fetch origin
    git branch -u origin/main main
    git remote set-head origin -a

Existing Pull-Requests have already been updated with the new branch name.

Thank you!

Regards,
Simon
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