upgrades: Allow matrix-synapse to be installed from bookworm
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Update the outdated apt preferences file that still refers to bullseye-backports instead of bookworm-backports.
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Perform matching using n= instead of a= for matching distribution codename.
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Drop preferences for libraries that were only required in bullseye-backports and not in bookworm-backports.
Tests:
- Install matrix-synapse app in testing container and stable container.
Signed-off-by: Sunil Mohan Adapa sunil@medhas.org