re: rust-grep-regex REMOVED from testing

[Peter Green <plugwash@debian.org>]

>   Previous version: 0.1.11-1
>   Current version:  (not in testing)
>   Hint: <https://release.debian.org/britney/hints/elbrus>
>     # 2023-11-04
>     # blocks lots of packages from migrating
>     # 1053431

Assuming your goal was to allow rust-regex and friends to
migrate to testing, you will also want to set removal
hints for rust-matchers and rust-loom.