devDependencies outdated

In `package.json` devDependencies are outdated, this causes package resolution issues when building with nodejs (version 19 of ngraph.graph is used instead of 20).
```
"node_modules/ngraph.fromjson": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/ngraph.fromjson/-/ngraph.fromjson-3.1.0.tgz",
"integrity": "sha512-Rxwiydsu4nd+rBDWKv1cnezwZeBL/ix8ORK8YnkH3i5EUXngjXihKZieP0DHME5hoZHJsZrdzif7XZ+GHcF7qg==",
"dependencies": {
"ngraph.graph": "^19.1.0"
}
},
"node_modules/ngraph.fromjson/node_modules/ngraph.graph": {
"version": "19.1.0",
"resolved": "https://registry.npmjs.org/ngraph.graph/-/ngraph.graph-19.1.0.tgz",
"integrity": "sha512-9cws84qfPkrYa7BaBtT+KgZfLXrd6pNL9Gl5Do+MBO/0Hm6rOM7qK78MZaO1uEoIK6p2pgUs6lu29zn/6tP59w==",
"dependencies": {
"ngraph.events": "^1.2.1"
}
},
```

Start with the devDependencies in package.json and reproduce the Node.js build or package-resolution issue described in the report. Update the outdated dependency declarations so ngraph.graph resolves to version 20 rather than 19, then verify that the build completes without the reported resolution problem.

Written by the indexing model from the issue text.