build(deps): bump matrix-sdk from 0.6.2 to 0.7.0 (#229)

Bumps [matrix-sdk](https://github.com/matrix-org/matrix-rust-sdk) from 0.6.2 to 0.7.0.
- [Release notes](https://github.com/matrix-org/matrix-rust-sdk/releases)
- [Commits](https://github.com/matrix-org/matrix-rust-sdk/commits)

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

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