Upgrade dependent packages to the latest version

[yhatt]

Happy new year 2022! This is the first PR for Marp projects in this year.

Notable changes

• Bumped patch version of development Node.js.
• Updated Babel config to match target Node.js into supported versions (>= 10).
• Upgraded color-string to v1.9.0.
  • It includes space-separted rgb() support, but Marpit is not affected this change because Marpit image syntax always split directives by space.