chore(deps): bump dev-dependencies to fix vulnerabilities reports (#1325)

This fixes the security audit in the CI that currently reports about
-
[RUSTSEC-2026-0204](https://rustsec.org/advisories/RUSTSEC-2026-0204.html),
and
-
[RUSTSEC-2026-0190](https://rustsec.org/advisories/RUSTSEC-2026-0190.html).

This bumps:
 - crossbeam-epoch from 0.9.18 to 0.9.20, and
 - anyhow from 1.0.102 to 1.0.103.

Author: baloo