Bump zeroconf from 0.27.1 to 0.28.0

Bumps [zeroconf](https://github.com/jstasiak/python-zeroconf) from 0.27.1 to 0.28.0.
- [Release notes](https://github.com/jstasiak/python-zeroconf/releases)
- [Commits](python-zeroconf/python-zeroconf@0.27.1...0.28.0)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -20,7 +20,7 @@ apispec = "^3.2.0"
 flask-cors = "^3.0.8"
 gevent = ">=1.4,<21.0"
 gevent-websocket = "^0.10.1"
-zeroconf = ">=0.24.5,<0.28.0"
+zeroconf = ">=0.24.5,<0.29.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.4"