fixup: add missed typing import guard

Author: RonnyPfannschmidt

src/setuptools_scm/integration.py

@@ -4,18 +4,21 @@
 import warnings
 from typing import Any
 from typing import Callable
+from typing import TYPE_CHECKING
 
 import setuptools
 
 from . import _get_version
-from . import _types as _t
 from . import _version_missing
 from ._entrypoints import iter_entry_points
 from .config import _read_dist_name_from_setup_cfg
 from .config import Configuration
 from .utils import do
 from .utils import trace
 
+if TYPE_CHECKING:
+    from . import _types as _t
+
 
 def _warn_on_old_setuptools(_version: str = setuptools.__version__) -> None:
     if int(_version.split(".")[0]) < 45: