There is a much simpler solution:
1- download the debian-ports-archive-keyring_2023.02.01_all.deb package from https://deb.debian.org/debian-ports/pool/main/d/debian-ports-archive-keyring/debian-ports-archive-keyring_2023.02.01_all.deb with wget or curl,
install with dpkg -i debian-ports-archive-keyring_2023.02.01_all.deb
2-Use the regular unstable ports directory in /etc/apt/sources.list:
deb http://ftp.ports.debian.org/debian-ports/ unstable main
instead of (or comment out)
#deb https://snapshot.debian.org/archive/debian-ports/20220616T194833Z unstable main
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