Mosquitto for Debian Buster

Hello!

I’ve seen to be having problems upgrading the mosquitto that comes on a default Raspbian Buster OS image we have been using for a couple of years

Because we are currently needing to use Chirpstack V4 and the mosquitto on the image is on a previous version, we were upgrading our mosquitto from version 1.5.7 to 2.X using a script.

Fragment of the script:
sudo systemctl stop mosquitto
sudo apt remove --purge mosquitto mosquitto-clients

sudo tee /etc/apt/sources.list.d/mosquitto.list > /dev/null <<EOF
deb Index of /debian/ buster main
EOF

wget -qO - https://repo.mosquitto.org/debian/mosquitto-repo.gpg.key | sudo apt-key add -
sudo apt update
sudo apt install -y mosquitto mosquitto-clients


This script has been working for almost two months now but since a week or so this doesn’t work anymore.

Has there been any changes recently?