chore: remove outdated dependencies

argparse and mock were listed as test dependencies, but both packages
are part of the python standard library and do not need to be installed.

Author: jorwoods

pyproject.toml

@@ -32,7 +32,7 @@ classifiers = [
 repository = "https://github.com/tableau/server-client-python"
 
 [project.optional-dependencies]
-test = ["argparse", "black==23.7", "mock", "mypy==1.4", "pytest>=7.0", "pytest-cov", "pytest-subtests",
+test = ["black==23.7", "mypy==1.4", "pytest>=7.0", "pytest-cov", "pytest-subtests",
     "requests-mock>=1.0,<2.0"]
 
 [tool.black]