Bump extern/kassert from e683aef to f0873f8 (#606)

Bumps [extern/kassert](https://github.com/kamping-site/kassert) from `e683aef` to `f0873f8`.
- [Commits](kamping-site/kassert@e683aef...f0873f8)

---
updated-dependencies:
- dependency-name: extern/kassert
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>