submodules: bump external/sapphire-paratime from bd6b14b to 894a14b

Bumps [external/sapphire-paratime](https://github.com/oasisprotocol/sapphire-paratime) from `bd6b14b` to `894a14b`.
- [Release notes](https://github.com/oasisprotocol/sapphire-paratime/releases)
- [Commits](oasisprotocol/sapphire-paratime@bd6b14b...894a14b)

---
updated-dependencies:
- dependency-name: external/sapphire-paratime
  dependency-version: 894a14bbc8611c1368860ff95624c08229724776
  dependency-type: direct:production
...

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

Author: dependabot[bot]