STYL: Fix linting issues

Author: bashtage

appveyor.yml

@@ -38,15 +38,17 @@ def ensure1d(
     x: int | float | Sequence[int | float] | ArrayLike,
     name: Hashable | None,
     series: Literal[True] = ...,
-) -> Series: ...  # pragma: no cover
+) -> Series:  # pragma: no cover
+    ...  # pragma: no cover
 
 
 @overload
 def ensure1d(
     x: int | float | Sequence[int | float] | ArrayLike,
     name: Hashable | None,
     series: Literal[False],
-) -> np.ndarray: ...  # pragma: no cover
+) -> np.ndarray:  # pragma: no cover
+    ...  # pragma: no cover
 
 
 def ensure1d(

arch/utility/array.py

@@ -48,7 +48,8 @@ def add_trend(
     prepend: bool = ...,
     nobs: int = ...,
     has_constant: Literal["raise", "add", "skip"] = ...,
-) -> Float64Array: ...  # pragma: no cover
+) -> Float64Array:  # pragma: no cover
+    ...  # pragma: no cover
 
 
 @overload
@@ -58,7 +59,8 @@ def add_trend(
     prepend: bool = ...,
     nobs: None = ...,
     has_constant: Literal["raise", "add", "skip"] = ...,
-) -> Float64Array: ...  # pragma: no cover
+) -> Float64Array:  # pragma: no cover
+    ...  # pragma: no cover
 
 
 @overload
@@ -68,7 +70,8 @@ def add_trend(
     prepend: bool = ...,
     nobs: None = ...,
     has_constant: Literal["raise", "add", "skip"] = ...,
-) -> pd.DataFrame: ...  # pragma: no cover
+) -> pd.DataFrame:  # pragma: no cover
+    ...  # pragma: no cover
 
 
 def add_trend(