Extend typing_extensions to <4.2.0 (#689) (#690)

Author: adrianeboyd

requirements.txt

@@ -12,7 +12,7 @@ pydantic>=1.7.4,!=1.8,!=1.8.1,<1.9.0
 numpy>=1.15.0
 # Backports of modern Python features
 dataclasses>=0.6,<1.0; python_version < "3.7"
-typing_extensions>=3.7.4.1,<4.0.0.0; python_version < "3.8"
+typing_extensions>=3.7.4.1,<4.2.0; python_version < "3.8"
 contextvars>=2.4,<3; python_version < "3.7"
 # Development dependencies
 cython>=0.25.0,<3.0

setup.cfg

@@ -51,7 +51,7 @@ install_requires =
     pydantic>=1.7.4,!=1.8,!=1.8.1,<1.9.0
     # Backports of modern Python features
     dataclasses>=0.6,<1.0; python_version < "3.7"
-    typing_extensions>=3.7.4.1,<4.0.0.0; python_version < "3.8"
+    typing_extensions>=3.7.4.1,<4.2.0; python_version < "3.8"
     contextvars>=2.4,<3; python_version < "3.7"
 
 [options.extras_require]