Update jsonpickle requirement from >=3.0,<4.1 to >=3.0,<4.2 (#248)

Updates the requirements on [jsonpickle](https://github.com/jsonpickle/jsonpickle) to permit the latest version.
- [Release notes](https://github.com/jsonpickle/jsonpickle/releases)
- [Changelog](https://github.com/jsonpickle/jsonpickle/blob/main/CHANGES.rst)
- [Commits](jsonpickle/jsonpickle@v3.0.0...v4.1.0)

---
updated-dependencies:
- dependency-name: jsonpickle
  dependency-version: 4.1.0
  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

@@ -25,7 +25,7 @@ python = "^3.9"
 protobuf = "5.29.4"
 grpcio = "1.70.0"
 grpcio-tools = "1.70.0"
-jsonpickle = ">=3.0,<4.1"
+jsonpickle = ">=3.0,<4.2"
 pymitter = ">=0.4,<1.1"
 typing-extensions = ">=4.11,<4.14"
 types-protobuf = "6.30.2.20250516"