fix mypy errors in scipy.signal

Author: jorenham

README.md

@@ -90,7 +90,7 @@ pip install scipy-stubs
 | `ndimage`     | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :full_moon:            |
 | `odr`         | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :waxing_crescent_moon: |
 | `optimize`    | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :x:                | :first_quarter_moon:   |
-| `signal`      | :heavy_check_mark:    | :heavy_check_mark: | :x:                | :x:                | :waxing_crescent_moon: |
+| `signal`      | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :x:                | :waxing_crescent_moon: |
 | `sparse`      | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :x:                | :waxing_crescent_moon: |
 | `spatial`     | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :waxing_gibbous_moon:  |
 | `special`     | :heavy_check_mark:    | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :first_quarter_moon:   |

scipy-stubs/signal/_ltisys.pyi

@@ -46,10 +46,6 @@ class lti(LinearTimeInvariant):
 class dlti(LinearTimeInvariant):
     def __new__(cls, *system, **kwargs) -> Self: ...
     def __init__(self, *system, **kwargs) -> None: ...
-    @property
-    def dt(self) -> Untyped: ...
-    @dt.setter
-    def dt(self, dt) -> None: ...
     def impulse(self, x0: Untyped | None = None, t: Untyped | None = None, n: Untyped | None = None) -> Untyped: ...
     def step(self, x0: Untyped | None = None, t: Untyped | None = None, n: Untyped | None = None) -> Untyped: ...
     def output(self, u, t, x0: Untyped | None = None) -> Untyped: ...
@@ -85,14 +81,6 @@ class ZerosPolesGain(LinearTimeInvariant):
     def __new__(cls, *system, **kwargs) -> Self: ...
     def __init__(self, *system, **kwargs) -> None: ...
     @property
-    def zeros(self) -> Untyped: ...
-    @zeros.setter
-    def zeros(self, zeros) -> None: ...
-    @property
-    def poles(self) -> Untyped: ...
-    @poles.setter
-    def poles(self, poles) -> None: ...
-    @property
     def gain(self) -> Untyped: ...
     @gain.setter
     def gain(self, gain) -> None: ...