.. and updates to `Cargo.toml`

.. for now by igoring it. Will properly address them in a follow-up

.. we pin `rustls` for now to make CI pass, but mid-term we want to
figure out a new MSRV target to bump to.

Previously, we decided to continue parsing any fields if we failed to
parse a known (i.e., `lightning` or `lno`) parameter failed to parse.
This however just hides the error and is a bit anti-idiomatic even
though allowing to use *some* URI fields even in the face of
incompatible formats for others.

Here we therefore opt to fail parsing the URI if any field fails.

We should drop this commit once
lightningdevkit/rust-lightning#3505 got in.

So far, we did not verify gossip data received via the peer-to-peer
network. As a small fix in the latest LDK release allows us properly set
the gossip verifier, we do so, and start verifying gossip when the
bitcoind RPC gossip source is set.