fix(deps): update rust crate cargo-audit to 0.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cargo-audit (source)	dependencies	minor	0.19.0 -> 0.20.0

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Release Notes

RustSec/rustsec (cargo-audit)

v0.20.0

• Completely rewritten cargo audit fix subcommand (#​1113)
  • Now it edits Cargo.lock as opposed to Cargo.toml, and performs only semver-compatible upgrades.
  • Fixes are performed by calling cargo update, migrating away from the unmaintained cargo-edit-9 crate.
  • The subcommand is still experimental, and its behavior may change in the future. It still requires enabling the non-default fix feature.
• Require tame-index 0.9.3 or later, fixing issues with some enterprise firewalls. (#​1103)

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