dep: Add pytest-cov package as a test dependency.

Author: anubhav756

packages/toolbox-core/pyproject.toml

@@ -46,6 +46,7 @@ test = [
     "pytest==8.3.5",
     "pytest-aioresponses==0.3.0",
     "pytest-asyncio==0.26.0",
+    "pytest-cov==6.1.0",
     "google-cloud-secret-manager==2.23.2",
     "google-cloud-storage==3.1.0",
 ]