修复由于可能存在问题的奇数长度顶点数组导致的数组越界问题

SpineRuntimes/SpineRuntime42/Skeleton.cs

@@ -742,7 +742,7 @@ namespace SpineRuntime42 {
 						verticesLength = clipper.ClippedVertices.Count;
 					}
 
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);