[Pkg-rust-maintainers] Bug#1147189: src:rust-askama: fails to migrate to testing for too long

[Peter Green]

> Current text from [2]:
> Migration status for rust-askama (0.12.1-4 to 0.16.0-1): BLOCKED: Rejected/violates migration policy/introduces a regression
> Issues preventing migration:
> ∙ ∙ migrating librust-askama-dev/0.16.0-1/amd64 to testing makes librust-askama-axum-dev/0.4.0-2+b1/amd64 uninstallable

rust-askama-axum should be removed, it's no longer supported upstream and is not used
by any applications in Debian.

> ∙ ∙ migrating librust-askama-dev/0.16.0-1/amd64 to testing makes librust-inquest-dev/0.3.2-1/amd64 uninstallable

I will deal with this once rust-rusqlite 0.40 is in testing.