remove pydantic mypy plugin (cf PR 14081)

fastapi/security/api_key.py

@@ -100,7 +100,7 @@ class APIKeyQuery(APIKeyBase):
         ] = True,
     ):
         self.model: APIKey = APIKey(
-            **{"in": APIKeyIn.query},
+            **{"in": APIKeyIn.query},  # type: ignore[arg-type]
             name=name,
             description=description,
         )
@@ -188,7 +188,7 @@ class APIKeyHeader(APIKeyBase):
         ] = True,
     ):
         self.model: APIKey = APIKey(
-            **{"in": APIKeyIn.header},
+            **{"in": APIKeyIn.header},  # type: ignore[arg-type]
             name=name,
             description=description,
         )
@@ -276,7 +276,7 @@ class APIKeyCookie(APIKeyBase):
         ] = True,
     ):
         self.model: APIKey = APIKey(
-            **{"in": APIKeyIn.cookie},
+            **{"in": APIKeyIn.cookie},  # type: ignore[arg-type]
             name=name,
             description=description,
         )

pyproject.toml

@@ -123,7 +123,6 @@ source-includes = [
 name = "fastapi-slim"
 
 [tool.mypy]
-plugins = ["pydantic.mypy"]
 strict = true
 
 [[tool.mypy.overrides]]