chore: pytest-mock added as project dependency

Author: Aviksaikat

setup.py

@@ -6,6 +6,7 @@
     "test": [  # `test` GitHub Action jobs uses this
         "pytest>=6.0",  # Core testing package
         "pytest-xdist",  # Multi-process runner
+        "pytest-mock",
         "pytest-cov",  # Coverage analyzer plugin
         "hypothesis>=6.2.0,<7.0",  # Strategy-based fuzzer
         "ape-arbitrum",  # For integration testing