Update pytest config

Replace all ignored warnings with "error" to make all warnings errors.

pyproject.toml

@@ -80,8 +80,5 @@ max-returns = 10
 
 [tool.pytest.ini_options]
 minversion = "7.0"
-filterwarnings = [
-    "ignore:.*imp module.*:DeprecationWarning",
-    # Remove when invoke updates to `inspect.signature()` or similar:
-    "ignore:.*inspect.getargspec().*:DeprecationWarning",
-]
+addopts = ["--cov=ci_cd", "--cov-report=term-missing"]
+filterwarnings = ["error"]