Can't Update - Repository not signed

Kind of a newby to the whole pihole. My issue is similar to this post, but I'm using Windows not Linux. I realize this is an OS problem and I need to replace the package, however I'm unsure of what to replace the package to. Appreciate any help I can get.

Expected Behaviour:
Update pihole to V5.0 on Windows

Actual Behaviour:
pi@raspberrypi:~ $ sudo apt-get update
Get:1 http://packages.azlux.fr/debian buster InRelease [3,983 B]
Hit:2 http://archive.raspberrypi.org/debian buster InRelease
Hit:3 http://raspbian.raspberrypi.org/raspbian buster InRelease
Err:1 http://packages.azlux.fr/debian buster InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CA548A0A0312D8E6
Reading package lists... Done
W: GPG error: http://packages.azlux.fr/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CA548A0A0312D8E6
E: The repository 'http://packages.azlux.fr/debian buster InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Debug Token:
https://tricorder.pi-hole.net/lktq9cc91h

Contact https://azlux.fr/ for support for their repository.

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