chore(deps): bump packages/subiquity_client from ada1bc0 to 42a2161

Bumps [packages/subiquity_client](https://github.com/canonical/subiquity_client.dart) from `ada1bc0` to `42a2161`.
- [Commits](canonical/subiquity_client.dart@ada1bc0...42a2161)

---
updated-dependencies:
- dependency-name: packages/subiquity_client
  dependency-type: direct:production
...

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