Don't Use an Overly Restrictive Type Hint for spline()'s parameters Argument

* Changed the type hint to `Sequence` instead of `List`, since other list-like objects are acceptable, as wel.

cadquery/cq.py

@@ -1672,7 +1672,7 @@ class Workplane(object):
         listOfXYTuple: Iterable[VectorLike],
         tangents: Optional[Sequence[VectorLike]] = None,
         periodic: bool = False,
-        parameters: Optional[List[float]] = None,
+        parameters: Optional[Sequence[float]] = None,
         scale: bool = True,
         tolerance: Optional[float] = None,
         forConstruction: bool = False,

cadquery/occ_impl/shapes.py

@@ -1406,7 +1406,7 @@ class Edge(Shape, Mixin1D):
         listOfVector: List[Vector],
         tangents: Optional[Sequence[Vector]] = None,
         periodic: bool = False,
-        parameters: Optional[List[float]] = None,
+        parameters: Optional[Sequence[float]] = None,
         scale: bool = True,
         tol: float = 1e-6,
     ) -> "Edge":