Revert "make auditing pass the hard way"

In 0e9299c (#1854), RUSTSEC-2025-0007 was listed as ignored to let
`cargo deny advisories` pass. That advisory has been withdrawn, as
noted in https://rustsec.org/advisories/RUSTSEC-2025-0007.html:

> After this advisory was published, the author graciously agreed
> to give access to the rustls team. The rustls team is committed
> to providing security (only) maintenance for *ring* for the
> foreseeable future.

It is no longer necessary to list that advisory as ignored.

This reverts commit 0e9299c.

Author: EliahKagan

deny.toml

@@ -8,7 +8,7 @@
 # More documentation for the advisories section can be found here:
 # https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html
 [advisories]
-ignore = ['RUSTSEC-2025-0007']
+ignore = []