Updates deps, adds mypy@0.920 compat, adds dependabot

.github/dependabot.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+- package-ecosystem: pip
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "02:00"
+  open-pull-requests-limit: 10
+
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "02:00"
+  open-pull-requests-limit: 10

.pre-commit-config.yaml

@@ -13,12 +13,12 @@ repos:
       - id: check-merge-conflict
       - id: end-of-file-fixer
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.20.0
+    rev: v2.29.1
     hooks:
       - id: pyupgrade
         args: ["--py36-plus"]
   - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v5.9.1
+    rev: v5.9.3
     hooks:
       - id: isort
         name: isort (python)
@@ -28,7 +28,7 @@ repos:
         types: [pyi]
         args: ["--profile", "black"]
   - repo: https://github.com/psf/black
-    rev: 21.6b0
+    rev: 21.12b0
     hooks:
       - id: black
   - repo: https://gitlab.com/pycqa/flake8

mypy_django_plugin/django/context.py

@@ -214,7 +214,7 @@ class DjangoContext:
                 field_name = field.name
                 gfk_info = helpers.lookup_class_typeinfo(api, field.__class__)
                 if gfk_info is None:
-                    gfk_set_type = AnyType(TypeOfAny.unannotated)
+                    gfk_set_type: MypyType = AnyType(TypeOfAny.unannotated)
                 else:
                     gfk_set_type = helpers.get_private_descriptor_type(
                         gfk_info, "_pyi_private_set_type", is_nullable=True