Remove tests/__init__.py and add frequenz-client-microgrid 0.9.1 dependency

Co-authored-by: Marenz <[email protected]>

Author: Copilot

pyproject.toml

@@ -42,6 +42,7 @@ dependencies = [
   "frequenz-channels >= 1.6.1, < 2.0.0",
   "frequenz-client-dispatch >= 0.11.2, < 0.12.0",
   "frequenz-client-base >= 0.11.0, < 0.12.0",
+  "frequenz-client-microgrid == 0.9.1",
 ]
 dynamic = ["version"]