add oak-security audit

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8640128) 77.44% compared to head (551ece4) 77.44%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #106 +/- ## ======================================= Coverage 77.44% 77.44% ======================================= Files 17 17 Lines 869 869 ======================================= Hits 673 673 Misses 196 196 ``` | [Files](https://app.codecov.io/gh/ralexstokes/ssz-rs/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex+Stokes) | Coverage Δ | | |---|---|---| | [ssz-rs/src/vector.rs](https://app.codecov.io/gh/ralexstokes/ssz-rs/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex+Stokes#diff-c3N6LXJzL3NyYy92ZWN0b3IucnM=) | `83.13% <100.00%> (ø)` | | | [ssz-rs/src/list.rs](https://app.codecov.io/gh/ralexstokes/ssz-rs/pull/106?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex+Stokes#diff-c3N6LXJzL3NyYy9saXN0LnJz) | `77.10% <0.00%> (ø)` | |

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