Update pyproject.toml

Use `jlpm` to build widget

Author: agoose77

{{cookiecutter.github_project_name}}/pyproject.toml

@@ -92,6 +92,7 @@ dependencies = [
 [tool.hatch.build.hooks.jupyter-builder.build-kwargs]
 path = "."
 build_cmd = "build:prod"
+npm = ["jlpm"]
 
 [tool.tbump]
 field = [