Bump simsimd from 3.7.7 to 3.8.1

Bumps [simsimd](https://github.com/ashvardanian/simsimd) from 3.7.7 to 3.8.1.
- [Release notes](https://github.com/ashvardanian/simsimd/releases)
- [Changelog](https://github.com/ashvardanian/SimSIMD/blob/main/.releaserc)
- [Commits](ashvardanian/SimSIMD@v3.7.7...v3.8.1)

---
updated-dependencies:
- dependency-name: simsimd
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>