RUSTSEC-2026-0244 is assigned to two crates, so cargo-audit cannot load the database at all

Since #3128 the advisory ID RUSTSEC-2026-0244 exists in two files:

crates/gettext-rs/RUSTSEC-2026-0244.md
crates/gettext-sys/RUSTSEC-2026-0244.md

That PR moved the advisory to gettext-sys but the copy under gettext-rs
was not removed, so both are present on main (currently 565436d8).

cargo-audit refuses to load the database when it sees a duplicate ID, which
means every cargo audit run fails, not only ones involving gettext:

    Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
error: error loading advisory database: parse error: duplicate advisory ID: RUSTSEC-2026-0244

Reproducing

cargo audit

on any project. Or directly:

ls ~/.cargo/advisory-db/crates/gettext-{rs,sys}/RUSTSEC-2026-0244.md

Impact

This is a hard failure rather than a warning, so it blocks any CI step or
pre-push hook that runs cargo audit. We hit it on several repositories today;
in one of them the pre-push gate refuses the push entirely, with 22 of 23
checks passing and only the advisory step failing.

Fix

Delete crates/gettext-rs/RUSTSEC-2026-0244.md, keeping the gettext-sys one
that #3128 intended.

Happy to open that PR if it is useful.

Start by inspecting crates/gettext-rs/RUSTSEC-2026-0244.md and the corresponding crates/gettext-sys/RUSTSEC-2026-0244.md entry. Run cargo audit or inspect the advisory database to reproduce the duplicate-ID parse error. Done means only the intended gettext-sys advisory remains and cargo audit loads the database successfully.