build(deps): bump janus from 1.1.0 to 1.2.0

Bumps [janus](https://github.com/aio-libs/janus) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/aio-libs/janus/releases)
- [Changelog](https://github.com/aio-libs/janus/blob/master/CHANGES.rst)
- [Commits](aio-libs/janus@v1.1.0...v1.2.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.test.txt

@@ -1,6 +1,6 @@
 # From our manifest.json for our custom component
 aiohttp_cors==0.7.0
-janus==1.1.0
+janus==1.2.0
 paho-mqtt==1.6.1
 # Strictly for tests
 pytest-homeassistant-custom-component==0.13.132