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This PR refreshes the Debian environments used in the CI configuration, as they've been out of date with respect to actual Debian releases for some time.
Use static release names corresponding to specific releases, rather than moving targets. In other words, replace names like "stable" and "testing" with specific distros, "bullseye", "bookworm", etc.
Remove configuration that assumed that "oldstable" referred to Debian 9, as this hasn't been the case since the Debian 11 release in mid-2021 and Debian 9 is fully EOL at this point anyway.