[node-red-ui-vega] Update to latest vega / vega-lite / vega-embed

[yasithdev]

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Proposed changes

Checklist

• [x] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [ ] I have run grunt to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality

[dceejay]

Hi - are you able to sign/click the CLA so we can merge this ?

[yasithdev]

Hello @dceejay, sorry I missed that! I've signed the CLA.

Cheers!

[dceejay]

Excellent - thanks