Bump zeroconf from 0.28.3 to 0.28.4

Bumps [zeroconf](https://github.com/jstasiak/python-zeroconf) from 0.28.3 to 0.28.4.
- [Release notes](https://github.com/jstasiak/python-zeroconf/releases)
- [Commits](python-zeroconf/python-zeroconf@0.28.3...0.28.4)

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