Bump openssl from 0.10.66 to 0.10.70 in /mycelium-ui

Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.66 to 0.10.70.
- [Release notes](https://github.com/sfackler/rust-openssl/releases)
- [Commits](rust-openssl/rust-openssl@openssl-v0.10.66...openssl-v0.10.70)

---
updated-dependencies:
- dependency-name: openssl
  dependency-type: indirect
...

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Author: dependabot[bot]