get Errors by updating the system. What does this mean?
admin@my:~$ sudo yunohost tools update
Info: Fetching available upgrades for system packages...
Warning: W: An error occurred during the signature verification. The repository is not updated and the
previous index files will be used. GPG error: https://packages.sury.org/php buster InRelease: The follo
wing signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <deb@sury.o
rg>
Warning: W: Failed to fetch https://packages.sury.org/php/dists/buster/InRelease The following signatu
res were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <deb@sury.org>
Warning: W: Some index files failed to download. They have been ignored, or old ones used instead.
Error: Something went wrong while updating the cache of APT (Debian's package manager). Here is a dump
of the sources.list lines, which might help identify problematic lines:
sources.list:deb http://httpredir.debian.org/debian buster main contrib non-free
sources.list:deb http://httpredir.debian.org/debian buster-updates main contrib non-free
sources.list:deb http://security.debian.org/ buster/updates main contrib non-free
sources.list.d/yunohost.list:deb http://forge.yunohost.org/debian/ buster stable
sources.list.d/extra_php_version.list:deb https://packages.sury.org/php/ buster main
sources.list.d/armbian.list:deb http://apt.armbian.com buster main buster-utils buster-desktop
Info: Updating application catalog…
Success! The application catalog has been updated!
thanks for help