Add `deny.toml` with a few exceptions, and update certain dependencies
to get rid of duplicates.
Running `cargo deny check` will yield some warnings still, but no
errors.
Previously we were announcing inventories all the time, due to
relying on the timestamp changing on insertion.
We change this to only announce our inventory when it actually changes.
This fixes an issue that came up in tests where we would be reading
and writing to the database at the same time, and it would fail with
an error due to the lock being contended on.
cloudhead
Alexis Sellier
xphoniex