[Pkg-rust-maintainers] Bug#1028432: debcargo patch to build with clap 4.

[Peter Michael Green]

Package: rust-debcargo

I've attached a patch which makes debcargo build with clap 4, debcargo
builds and it's cargo tests run succesfully, but I haven't actually done any
testing of the command line interface with this patch.

Fabian and I have agreed on irc that it probablly doesn't make sense to
switch debcargo to clap 4 in bookworm. I'm posting this patch here to
preserve it for trixie.
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