RUSTSEC-2023-0052: webpki: CPU denial of service in certificate path building

> webpki: CPU denial of service in certificate path building

| Details | |
| ------------------- | ---------------------------------------------- |
| Package | `webpki` |
| Version | `0.22.0` |
| Date | 2023-08-22 |

When this crate is given a pathological certificate chain to validate, it will
spend CPU time exponential with the number of candidate certificates at each
step of path building.

Both TLS clients and TLS servers that accept client certificate are affected.

This was previously reported in
<https://github.com/briansmith/webpki/issues/69> and re-reported recently
by Luke Malinowski.

`rustls-webpki` is a fork of this crate which contains a fix for this issue
and is actively maintained.

See [advisory page](https://rustsec.org/advisories/RUSTSEC-2023-0052.html) for additional details.

Start by locating the dependency manifests and uses of webpki in this Rust repository. Review the RUSTSEC-2023-0052 advisory and the rustls-webpki fork mentioned in the issue, then run the existing test suite and dependency audit after the affected dependency path is addressed.

Written by the indexing model from the issue text.