Cannot update packages after adding Sublime Text repo

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you forgot to add/install the sublime gpg key to the pacman keyring

https://www.sublimetext.com/docs/3/linux_repositories.html#pacman

pacman

Install the GPG key:

curl -O https://download.sublimetext.com/sublimehq-pub.gpg && sudo pacman-key --add sublimehq-pub.gpg && sudo pacman-key --lsign-key 8A8F901A && rm sublimehq-pub.gpg

Select the channel to use:
Stable

echo -e "\n[sublime-text]\nServer = https://download.sublimetext.com/arch/stable/x86_64" | sudo tee -a /etc/pacman.conf

Dev

echo -e "\n[sublime-text]\nServer = https://download.sublimetext.com/arch/dev/x86_64" | sudo tee -a /etc/pacman.conf

Update pacman and install Sublime Text

sudo pacman -Syu sublime-text