Bump frequenz-client-base to 0.2.1

This is to get the wider range of supported protobuf versions, which
includes the one we are using in this project and the SDK.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

pyproject.toml

@@ -38,7 +38,7 @@ requires-python = ">= 3.11, < 4"
 dependencies = [
   "frequenz-api-microgrid >= 0.15.3, < 0.16.0",
   "frequenz-channels == 1.0.0b2",
-  "frequenz-client-base >= 0.2.0, < 0.3.0",
+  "frequenz-client-base >= 0.2.1, < 0.3.0",
   "grpcio >= 1.54.2, < 2",
   "protobuf >= 4.21.6, < 5",
   "timezonefinder >= 6.2.0, < 7",