Address mypy error that only appears in CI

ixmp4/core/exceptions.py

@@ -18,7 +18,11 @@ class ProgrammingError(Exception):
 # NOTE mypy seems to say Exception has type Any, don't see how we could change that
 class RemoteExceptionMeta(ExcMeta):  # type: ignore[misc]
     def __new__(
-        cls, name: str, bases: tuple[object], namespace: dict[str, Any], **kwargs: Any
+        cls,
+        name: str,
+        bases: tuple[type, ...],
+        namespace: dict[str, Any],
+        **kwargs: Any,
     ) -> type["IxmpError"]:
         http_error_name = namespace.get("http_error_name", None)
         if http_error_name is not None:

ixmp4/data/abstract/base.py

@@ -14,7 +14,7 @@
 
 class BaseMeta(_ProtocolMeta):
     def __init__(
-        self, name: str, bases: tuple[object], namespace: dict[str, Any]
+        self, name: str, bases: tuple[type, ...], namespace: dict[str, Any]
     ) -> None:
         super().__init__(name, bases, namespace)
         self.NotUnique = type(

ixmp4/db/filters.py

@@ -125,7 +125,11 @@ def _ensure_str_list(any_list: list[Any]) -> list[str]:
 # NOTE mypy seems to say PydanticMeta has type Any, don't see how we could change that
 class FilterMeta(PydanticMeta):  # type: ignore[misc]
     def __new__(
-        cls, name: str, bases: tuple[object], namespace: dict[str, Any], **kwargs: Any
+        cls,
+        name: str,
+        bases: tuple[type, ...],
+        namespace: dict[str, Any],
+        **kwargs: Any,
     ) -> type["BaseFilter"]:
         annots = namespace.get("__annotations__", {}).copy()
         for name, annot in annots.items():