E: Some index files failed to download. They have been ignored, or old ones used instead.
root@chrx:~# apt update 
Get:1 http://mirror.isoc.org.il/pub/debian testing InRelease [117 kB]
E: Repository 'http://mirror.isoc.org.il/pub/debian testing InRelease' changed its 'Codename' value from 'buster' to 'bullseye'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Do you want to accept these changes and continue updating from this repository? [y/N] y
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease