Automate running cargo-audit to catch dependencies with security vulnerabilities

[romoh]

Is your feature request related to a problem? Please describe.
It is related to #208

Is your feature request related to a way you would like Akri extended? Please describe.
No, it is related to keeping Akri dependencies secure.

Describe the solution you'd like
cargo-audit is a tool which inspects Cargo.lock files and compares them against the RustSec Advisory Database, a community database of security vulnerabilities. It can detect dependencies with security risks and thus it will be useful to automatically run cargo-audit with pull requests through gitactions to catch issues for newly added dependencies.

Describe alternatives you've considered
N/A

Additional context
N/A