Attempt to fix errors in mypy for PyPy (test of hypothesis)

Author: abravalheri

pytest.ini

@@ -18,6 +18,12 @@ filterwarnings=
 	# Ensure ResourceWarnings are emitted
 	default::ResourceWarning
 
+	# python/mypy#17057
+	ignore:'encoding' argument not specified::mypy.config_parser
+	ignore:'encoding' argument not specified::mypy.build
+	ignore:'encoding' argument not specified::mypy.modulefinder
+	ignore:'encoding' argument not specified::mypy.metastore
+
 	# realpython/pytest-mypy#152
 	ignore:'encoding' argument not specified::pytest_mypy