The "CET" time zone has vanished between Debian 12 and 13.
For good reasons. This is not a time zone but a time zone abbreviation. We should use "Europe/Paris" instead.
Now we have a crisis meeting because it's a major breaking change that can't be fixed because nobody knows how to set the time zone to a different value in the application ๐คฆโโ๏ธ
https://salsa.debian.org/glibc-team/tzdata/-/commit/42c0008f86a5a53e1a37fefa93fdd3685313e86f
