upgrades: Fix sources list for dist upgrade from buster
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Check apt sources list regardless of whether we are upgrading to stable or testing.
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Replace stable code name with new stable code name.
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When testing, also replace "stable" with code name to be tested.
I did a basic test (no extra apps installed) in a stable VM using --develop --test
options.
Signed-off-by: James Valleroy jvalleroy@mailbox.org