fix: type declaration (from 1d to 1.0)

Author: f-frhs

src/Spatial/Euclidean/Circle2D.cs

@@ -167,7 +167,7 @@ private double[] findParameterTs(Line2D line)
             var d = line.Direction;
             var r = this.Radius;
 
-            var a = 1d;
+            var a = 1.0;
             var b = 2 * (s.DotProduct(d) - d.DotProduct(cc));
             var c = (s - cc).DotProduct(s - cc) - r * r;