Fix type annotation for resolve_types() (#1141)

Author: hynek

Diff for: changelog.d/1141.change.md

@@ -0,0 +1 @@
+The type annotation for `attrs.resolve_types()` is now correct.

Diff for: src/attr/__init__.pyi

@@ -69,8 +69,7 @@ _ValidatorArgType = Union[_ValidatorType[_T], Sequence[_ValidatorType[_T]]]
 class AttrsInstance(AttrsInstance_, Protocol):
     pass
 
-_A = TypeVar("_A", bound=AttrsInstance)
-# _make --
+_A = TypeVar("_A", bound=type[AttrsInstance])
 
 class _Nothing(enum.Enum):
     NOTHING = enum.auto()

Diff for: tests/typing_example.py

@@ -468,3 +468,8 @@ def accessing_from_attrs() -> None:
 @attrs.define(unsafe_hash=True)
 class Hashable:
     pass
+
+
+def test(cls: type) -> None:
+    if attr.has(cls):
+        attr.resolve_types(cls)