[action] [PR:18678] Use the archive repo for Buster (#18678) #19031
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Why I did it
Buster is EOL, and the backports section has been removed from the main Debian repos. This also means that our default mirror (for non-snapshot builds) is also affected.
Work item tracking
Microsoft ADO (number only): 27691460
How I did it
Change to using archive.debian.org directly for Buster.
How to verify it