chore(deps-dev): bump vega from 5.19.1 to 5.20.0

[dependabot-preview]

Bumps vega from 5.19.1 to 5.20.0.

Release notes

Sourced from vega's releases.

v5.20.0

Changes from v5.19.1:

monorepo

• Update CI configuration. (thanks @domoritz!)
• Update build configuration. (thanks @domoritz!)
• Update dependencies.

vega

• Add web test for external element binding.

vega-scenegraph

• Add early exit for image rendering with zero width or height.

vega-schema

• Add signal binding to external input element.

vega-typings

• Add signal binding to external input element.

vega-util

• Update inherit utility to use defineProperty, avoids upsetting configurations that ban assignment overrides of Object prototype properties. (#3109, thanks @erights!)

vega-view

• Add signal binding to external input element.

Commits

• f262105 feat: add typing to label-transform properties (#3127)
• 9c86412 docs: Update docs build files.
• f75b41d fix: Keep node 10 compatibility.
• 14e9bb2 docs: Document external input binding.
• 0bb38c5 fix: Update external input binding, track listener.
• fbe8422 test: Update bind external web test.
• 5c94fe8 chore: Bump rollup dependency.
• 9db9378 chore: Bump version numbers.
• 4aa9714 chore: Update dev dependencies.
• a243afe fix: Early exit on empty images.
• Additional commits viewable in compare view

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