How did I fix «An error occurred while fetching Certbot snap plugins» on `certbot renew` on Debian 12?

Unix Debian
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$ sudo certbot renew ; sudo service nginx stop && sudo service nginx start
An error occurred while fetching Certbot snap plugins: make sure the snapd service is running.
An unexpected error occurred:
requests.exceptions.ReadTimeout: _SnapdConnectionPool(host='localhost', port=None): Read timed out. (read timeout=30.0)
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