[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

xarray/core/groupby.py

@@ -619,7 +619,9 @@ def _validate_groupby_squeeze(squeeze: bool | None) -> None:
     # A future version could make squeeze kwarg only, but would face
     # backward-compat issues.
     if squeeze is not None and not isinstance(squeeze, bool):
-         raise TypeError(f"`squeeze` must be None,  True or False, but {squeeze} was supplied")
+        raise TypeError(
+            f"`squeeze` must be None,  True or False, but {squeeze} was supplied"
+        )
 
 
 def _resolve_group(obj: T_Xarray, group: T_Group | Hashable) -> T_Group: