Fix CI: add typecheck suppression & upgrade flake8-pyi (#303)

* Added suppression for a new test in upstream
* Upgraded flake8-pyi to be compatible with flake8 v6:

Author: intgr

.pre-commit-config.yaml

@@ -28,7 +28,7 @@ repos:
     hooks:
       - id: flake8
         additional_dependencies:
-        - flake8-pyi==22.10.0
+        - flake8-pyi==22.11.0
         types: []
         files: ^.*.pyi?$
   - repo: local

scripts/typecheck_tests.py

@@ -83,7 +83,10 @@
     "browsable_api": [
         'expression has type "List[Dict[str, Dict[str, int]]]"',
     ],
-    "models.py": ['"ForeignKeyTarget" has no attribute "sources"'],
+    "models.py": [
+        '"ForeignKeyTarget" has no attribute "sources"',
+        '"CustomManager" not callable',
+    ],
     "serializers.pyi": [
         'note: "IntegerSerializer" defined here',
     ],