Add protobuf dependency version to setup.cfg

Author: psch0rr

kuksa-client/setup.cfg

@@ -29,6 +29,7 @@ install_requires =
     pygments >= 2.15
     # Make sure to use the same version criteria in pyproject.toml and update requirements.txt after changing
     grpcio-tools == 1.68.0
+    protobuf == 5.29.6
     jsonpath-ng >= 1.5.3
 packages = find: