Fix circular import

Author: PProfizi

src/ansys/dpf/core/core.py

@@ -27,10 +27,14 @@
 import logging
 import os
 from pathlib import Path, PurePosixPath, PureWindowsPath
+from typing import TYPE_CHECKING
 import warnings
 import weakref
 
-from ansys.dpf.core import AnyServerType, errors, misc, server as server_module
+from ansys.dpf.core import errors, misc, server as server_module
+
+if TYPE_CHECKING:  # pragma: noqa
+    from ansys.dpf.core import AnyServerType
 from ansys.dpf.core.check_version import server_meet_version, version_requires
 from ansys.dpf.core.runtime_config import (
     RuntimeClientConfig,