[jupyter] Fix 404 issue when publishing keplergl npm package

[lixun910]

• The current action build-publish-pypi throws an error at step Publish kepler-jupyter to NPM. See https://github.com/keplergl/kepler.gl/runs/3617500852?check_suite_focus=true

npm ERR! code E404
npm ERR! 404 Not Found - PUT https://registry.npmjs.org/keplergl-jupyter - Not found
npm ERR! 404 
npm ERR! 404  'keplergl-jupyter@0.3.2' is not in the npm registry.

• According to npm publish 404 Not Found - PUT npm/cli#1637, adding an explicit registry URL should avoid 404 issue when publishing keplergl npm package.

• Since this error didn't impact publishing (see https://www.npmjs.com/package/keplergl-jupyter), we can test it out in the next kepler-jupyter release.

[heshan0131]

I guess we can only test this when we create a new release

[lixun910]

@heshan0131 Good point! Let me test it on my forked repo first -- at least it should not report 404 error but 403 forbidden error.

[lixun910]

Checked! 👍