[Pkg-rust-maintainers] Bug#1033335: Don't include in Bookworm

[Alexander Kjäll]

Hi

The list-rdeps.sh script in
https://salsa.debian.org/rust-team/debcargo-conf/ shows that it's in
use:

$ ./dev/list-rdeps.sh const-cstr
Versions of rust-const-cstr in unstable:
  librust-const-cstr-dev                           0.3.0-1+b1

Versions of rdeps of rust-const-cstr in unstable, that also exist in testing:
  librust-yeslogic-fontconfig-sys-dev              3.0.1-1+b1
depends on     librust-const-cstr-0.3+default-dev,

And since unmaintained is just a notification about how fast the
maintainer responds, and not really a security problem in itself I
would rather not remove it as it might set of further deletions.

//Alex