To create a new release on NPM you need to create a release on Github and the release.yml action will then deploy a release on NPM.
This requires NPM_TOKEN to be setup as a repository secret. This will update the package at:
https://www.npmjs.com/package/@iiif/3d-manifesto-dev
To update the version number in NPM you will also need to update the version number in package.json.