Update bpmn-js-example-custom-shapes

I bumped it but when I’m now trying to build the example and run it in my browser, it gets “aborted do to warning”. A SyntaxError Unexpected token (30:4) while parsing file: …node_modules\bpmn-js\lib\features\outline\OutlineUtil.js.

then…

SyntaxError Unexpected token (290:6) while parsing file: …node_modules\bpmn-js\lib\features\popup-menu\ReplaceMenuProvider.js

It does not seem trivial to update the example. I am grateful for help.