Upgrade elastic charts 19.6.3

[nickofthyme]

Summary

• upgrade elastic charts to 19.6.3
• add background.color to eui chart theme

Checklist

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in IE11 and Firefox
• Props have proper autodocs
• Added documentation
• Checked Code Sandbox works for the any docs examples
• Added or updated jest tests
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[cchaos]

Thanks @nickofthyme ! Since this updates a peer-dependency and a consumed output file, it will need a changelog.

[nickofthyme]

Ok thanks, I added a note about the src changes.

I wasn't sure what you meant by the peer dependency changes because none of the peer dependencies of @elastic/eui have changed. Are you talking about adding @popperjs/core and chroma-js? If so what should I add?

[chandlerprall]

Pulled up the package.json & yarn.lock changes and compared with our devDeps & peerDeps, this change only affects the former and not peerDeps. No changelog needed (for that change, the background color one is still needed as you have it), but thank you @cchaos for thinking of it!

[nickofthyme]

Ok thanks for the clarification. Thanks @chandlerprall and @cchaos for the review! 👍

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_3669/

[cchaos]

I'll eventually revisit how we are actually doing this and probably want document it. I'll make a note or issue for follow-up.

[cchaos]

Meant to also say THANK YOU @nickofthyme !

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_3669/