remove spurious type in union

Author: patrick-kidger

diffrax/_custom_types.py

@@ -21,7 +21,7 @@
     BoolScalarLike = bool | Array | np.ndarray
     FloatScalarLike = float | Array | np.ndarray
     IntScalarLike = int | Array | np.ndarray
-    RealScalarLike = bool | int | float | Array | np.ndarray
+    RealScalarLike = int | float | Array | np.ndarray
 else:
     BoolScalarLike = Bool[ArrayLike, ""]
     FloatScalarLike = Float[ArrayLike, ""]