Fix Security Audit

[c-thiel]

Currently the security Audit is failing:
https://github.com/hansetag/iceberg-rest-server/actions/runs/9081717741

[twuebi]

I looked a bit into this, it appears there's an issue with the rsa implementation used as transitive dependencies of some of our dependencies, from the looks it seems to be rather long-standing, there's work happening to resolve it but not much movement since April.

The other one is yaml-serde which has recently been marked as unmaintained, some background can be found here.

Both don't seem to have any quick fixes, we may want to consider to ignore these advisories via a audit.toml (https://github.com/rustsec/rustsec/blob/main/cargo-audit/audit.toml.example) and monitor their status.

[c-thiel]

To get rid of the issue caused by config, we could also think about moving to clap instead