Adjust other installations of setuptools

Author: astrojuanlu

readthedocs/doc_builder/python_environments.py

@@ -480,7 +480,7 @@ def install_core_requirements(self):
             positive='pip<20.3',
             negative='pip',
         )
-        cmd = pip_install_cmd + [pip_version, 'setuptools']
+        cmd = pip_install_cmd + [pip_version, 'setuptools<58.3.0']
         self.build_env.run(
             *cmd, bin_path=self.venv_bin(), cwd=self.checkout_path
         )

readthedocs/rtd_tests/tests/test_doc_building.py

@@ -1234,7 +1234,7 @@ def test_install_core_requirements_sphinx(self, checkout_path):
         self.assertEqual(self.build_env_mock.run.call_count, 2)
         calls = self.build_env_mock.run.call_args_list
 
-        core_args = self.pip_install_args + ['pip', 'setuptools']
+        core_args = self.pip_install_args + ['pip', 'setuptools<58.3.0']
         self.assertArgsStartsWith(core_args, calls[0])
 
         requirements = self.base_requirements + requirements_sphinx
@@ -1259,7 +1259,7 @@ def test_install_core_requirements_mkdocs(self, checkout_path):
         self.assertEqual(self.build_env_mock.run.call_count, 2)
         calls = self.build_env_mock.run.call_args_list
 
-        core_args = self.pip_install_args + ['pip', 'setuptools']
+        core_args = self.pip_install_args + ['pip', 'setuptools<58.3.0']
         self.assertArgsStartsWith(core_args, calls[0])
 
         requirements = self.base_requirements + requirements_mkdocs