update data in drawEdge-test.js to Graphviz version 9.0.0 format

The positioning of `normal` arrow was slightly improved in Graphviz
9.0.0 through commit
https://gitlab.com/graphviz/graphviz/-/commit/de0bc073013331eddcca0f2cd33219aba9b231db. See
https://gitlab.com/graphviz/graphviz/-/blob/main/CHANGELOG.md#900-2023-09-11.

test/drawEdge-test.js

@@ -30,12 +30,12 @@ it("Check our understanding of how Graphviz draws edges.", async () => {
     assert.equal(d3.selectAll('path').size(), num_edges, 'Number of initial paths');
     const arrowHeadLength = 10;
     const arrowHeadWidth = 7;
-    const margin = -0.14;
+    const margin = -0.1;
     // start of edge tail
     const x1 = 54.4;
     const y1 = -18;
      // end of edge arrowhead
-    const x2 = 88.62;
+    const x2 = 88.1;
     const y2 = -18.000;
 
     const line = d3.selectAll('.edge').selectAll('path').filter(function (d) {
@@ -55,9 +55,9 @@ it("Check our understanding of how Graphviz draws edges.", async () => {
     var expected_y = [];
     expected_x.push(x1);
     expected_y.push(y1);
-    expected_x.push(62.06);
+    expected_x.push(61.89);
     expected_y.push(y1);
-    expected_x.push(70.57);
+    expected_x.push(70.18);
     expected_y.push(y1);
     expected_x.push(Math.round((x2 - margin - arrowHeadLength) * 1000) / 1000);
     expected_y.push(y2);