Bump typed_ast max dependency (#11560)

Original PR #11531, modified for the 0.920 branch.

Cf. #11158

Author: srittau

mypy-requirements.txt

@@ -1,4 +1,4 @@
 typing_extensions>=3.7.4
 mypy_extensions>=0.4.3,<0.5.0
-typed_ast>=1.4.0,<1.5.0
+typed_ast>=1.4.0,<2
 tomli>=1.1.0,<1.2.0

setup.py

@@ -190,13 +190,13 @@ def run(self):
       classifiers=classifiers,
       cmdclass=cmdclass,
       # When changing this, also update mypy-requirements.txt.
-      install_requires=["typed_ast >= 1.4.0, < 1.5.0; python_version<'3.8'",
+      install_requires=["typed_ast >= 1.4.0, < 2; python_version<'3.8'",
                         'typing_extensions>=3.7.4',
                         'mypy_extensions >= 0.4.3, < 0.5.0',
                         'tomli>=1.1.0,<1.2.0',
                         ],
       # Same here.
-      extras_require={'dmypy': 'psutil >= 4.0', 'python2': 'typed_ast >= 1.4.0, < 1.5.0'},
+      extras_require={'dmypy': 'psutil >= 4.0', 'python2': 'typed_ast >= 1.4.0, < 2'},
       python_requires=">=3.6",
       include_package_data=True,
       project_urls={