Can't do apt-update because code name is changed from bullseye to bookworm

[Richard Forst <sterbl.ta@tutanota.com>]

When doing apt-get update, debian throws following error. It looks like because the code name changed from bullseye to bookworm. 

E: Repository 'http://security.debian.org testing-security InRelease' changed its 'Codename' value from 'bullseye-security' to 'bookworm-security'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
E: Repository 'https://deb.debian.org/debian testing InRelease' changed its 'Codename' value from 'bullseye' to 'bookworm'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://download.zulip.com/desktop/apt stable InRelease' doesn't support architecture 'i386'

However in my sources.list is neither bullseye nor bookworm as below (I use testing-security). How can I fix this error?Thanks

$ sudo cat /etc/apt/sources.list
# security 
deb http://security.debian.org testing-security main contrib non-free
deb-src http://security.debian.org testing-security main contrib non-free


My environment are:
$ cat /etc/debian_version 
11.0
$ uname -r
5.10.0-6-amd64