Update mypy version

An update was required to fix the issue described here:
python/mypy#12078

Author: ViacheslavKolupaev

requirements/compiled/03_type_test_requirements.txt

@@ -8,7 +8,7 @@ greenlet==1.1.2
     # via
     #   -c /home/vkolupaev/PycharmProjects/notebook/requirements/in/../compiled/01_app_requirements.txt
     #   sqlalchemy
-mypy==0.930
+mypy==0.931
     # via
     #   -r /home/vkolupaev/PycharmProjects/notebook/requirements/in/03_type_test.in
     #   sqlalchemy

requirements/in/03_type_test.in

@@ -1,7 +1,8 @@
 -c ../compiled/01_app_requirements.txt
 
 # See: https://pydantic-docs.helpmanual.io/mypy_plugin/#enabling-the-plugin
-mypy==0.930
+# And this: https://github.com/python/mypy/pull/12078
+mypy==0.931
 
 pydantic
 types-psycopg2