fix: Bump quinn-proto to 0.11.14 to resolve RUSTSEC-2026-0037 (#12226)
## Summary
- Bumps transitive dependency `quinn-proto` from `0.11.8` to `0.11.14`
via lockfile update to resolve
[RUSTSEC-2026-0037](https://rustsec.org/advisories/RUSTSEC-2026-0037)
(high severity DoS in Quinn endpoints).
- Lockfile-only change — no `Cargo.toml` modifications.