Increase the layout benchmark timeout a bit more again.

GDJS/tests/benchmarks/layer.js

@@ -10,7 +10,8 @@ describe('gdjs.Layer', function() {
   var runtimeScene = new gdjs.RuntimeScene(runtimeGame);
 
   it('benchmark convertCoords and convertInverseCoords', function() {
-    this.timeout(30000);
+    // TODO EBO Understand why the timeout need to be 35s instead of 20s to pass on CI.
+    this.timeout(35000);
     var layer = new gdjs.Layer(
       { name: 'My layer', 
         visibility: true,