distribution CentOS Stream - changes :
- last release downgrade from ‘10-stream’ to ‘8.5.2111’
- last url from ‘https://mirror.in2p3.fr/pub/linux/centos-stream/10-stream/BaseOS/x86_64/iso/CentOS-Stream-10-latest-x86_64-dvd1.iso’ to ‘https://mirror.in2p3.fr/pub/linux/centos-vault/8.5.2111/isos/x86_64/CentOS-8.5.2111-x86_64-dvd1.iso’