Update pymitter requirement from ~0.4 to >=0.4,<0.6 (#89)

Updates the requirements on [pymitter](https://github.com/riga/pymitter) to permit the latest version.
- [Release notes](https://github.com/riga/pymitter/releases)
- [Commits](riga/pymitter@v0.4.0...v0.5.0)

---
updated-dependencies:
- dependency-name: pymitter
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -26,7 +26,7 @@ protobuf = ">=4.23,<4.26"
 grpcio = ">=1.54,<1.60"
 grpcio-tools = ">=1.54,<1.60"
 jsonpickle = "~3.0"
-pymitter = "~0.4"
+pymitter = ">=0.4,<0.6"
 
 [tool.poetry.dev-dependencies]
 pytest = "~7.4"