submodules: bump external/oasis-sdk from 24610a0 to 394da33

Bumps [external/oasis-sdk](https://github.com/oasisprotocol/oasis-sdk) from `24610a0` to `394da33`.
- [Release notes](https://github.com/oasisprotocol/oasis-sdk/releases)
- [Commits](oasisprotocol/oasis-sdk@24610a0...394da33)

---
updated-dependencies:
- dependency-name: external/oasis-sdk
  dependency-version: 394da333625a189abd8b752a9f2dc46bb883a781
  dependency-type: direct:production
...

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Author: dependabot[bot]