fix: handle annotations in positional-only args

flake8_type_checking/checker.py

@@ -671,7 +671,7 @@ def register_function_annotations(self, node: Union[FunctionDef, AsyncFunctionDe
 
         And we also note down the start and end line number for the function.
         """
-        for path in [node.args.args, node.args.kwonlyargs]:
+        for path in [node.args.args, node.args.kwonlyargs, node.args.posonlyargs]:
             for argument in path:
                 if hasattr(argument, 'annotation') and argument.annotation:
                     self.add_annotation(argument.annotation)

tests/test_tc004.py

@@ -70,6 +70,18 @@ def example(*args: Any, **kwargs: Any):
         ),
         set(),
     ),
+    (
+        textwrap.dedent(
+            """
+    if TYPE_CHECKING:
+        from typing import List, Sequence, Set
+
+    def example(a: List[int], /, b: Sequence[int], *, c: Set[int]):
+        return
+    """
+        ),
+        set(),
+    ),
     # Used different places, but where each function scope has it's own import
     (
         textwrap.dedent(