Bump oqs-sys/liboqs from 6e1f49a to ebf4638

Bumps [oqs-sys/liboqs](https://github.com/Open-Quantum-Safe/liboqs) from `6e1f49a` to `ebf4638`.
- [Release notes](https://github.com/Open-Quantum-Safe/liboqs/releases)
- [Commits](open-quantum-safe/liboqs@6e1f49a...ebf4638)

---
updated-dependencies:
- dependency-name: oqs-sys/liboqs
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>