Update pymitter requirement from >=0.4,<1.1 to >=0.4,<1.2

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...v1.1.2)

---
updated-dependencies:
- dependency-name: pymitter
  dependency-version: 1.1.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -26,7 +26,7 @@ protobuf = "5.29.5"
 grpcio = "1.73.0"
 grpcio-tools = "1.71.0"
 jsonpickle = ">=3.0,<4.2"
-pymitter = ">=0.4,<1.1"
+pymitter = ">=0.4,<1.2"
 typing-extensions = ">=4.11,<4.15"
 types-protobuf = "6.30.2.20250703"
 pympler = "1.1"