Update detection for supported Linux distros as at MongoDB 6.0

[stennie]

Update list of detected distros, eg: Ubuntu 20.04 (which will currently incorrectly fall through to installing 18.04 packages).

[stennie]

Per https://www.mongodb.com/docs/manual/administration/production-notes/, add:

• Debian 11
• Ubuntu 20.04
• RHEL/CentOS/Oracle Linux/Rocky/Alma 8.0+
• SLES / SUSE 15