Enforce deprecation of np attributes deprecated in NumPy 1.20

Also fail when attributes are used in eval expressions.

This prepares for upgrade to NumPy 1.24 which removes deprecated names.

Author: pavoljuhas

pyproject.toml

@@ -7,4 +7,15 @@ skip-magic-trailing-comma = true
 [tool.pytest.ini_options]
 filterwarnings = [
     "ignore:Matplotlib is currently using agg:UserWarning",
+    # TODO(#5967) - remove after upgrade to NumPy 1.24
+    # Enforce NumPy 1.20 deprecations.
+    # Ref: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
+    "error:`np.bool` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.int` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.float` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.complex` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.object` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.str` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.long` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
+    "error:`np.unicode` is a deprecated alias:DeprecationWarning:(cirq|<string>)",
 ]