v0.5.1

Changed

• Replaced the optional sqlx dependency with sqlx-core so enabling the
  feature no longer pulls in rsa via the MySQL driver, fixing the
  RUSTSEC-2023-0071 advisory reported by cargo audit.

Security

• Added cargo audit to the pre-commit hook and CI workflow; published a
  README badge to surface the audit status.

Added

• Composite GitHub Action (.github/actions/cargo-deny) that installs and runs
  cargo-deny checks for reuse across workflows.
• cargo deny step in the reusable CI pipeline to catch advisories, bans,
  license and source issues automatically.
• README badges surfacing the Cargo Deny status so consumers can quickly verify
  supply-chain checks.