ci: Update audit workflow and bytes dependency

- Add `tool-version` parameter in audit workflow
that forces the `actions-rust-lang/audit` to
download and use a version that supports CVSS 4.0.
- update a transitive dependency `bytes` to v1.11.
1 that fixes `RUSTSEC-2026-0007` security
vulnerability

Fixes #239

Author: tvpeter

.github/workflows/audit.yml

@@ -13,7 +13,8 @@ jobs:
   security_audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions-rust-lang/audit@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          tool-version: 0.22.1