Upgrade to gulp v4, npm v8, node v16

[jruales]

• Upgraded gulp to version 4
  • gulp v3 has issues with recent versions of node, so I've upgraded to gulp v4 which supports the latest version of node.
  • Upgrading required using gulp.serial() and gulp.parallel()
  • I also had to move "build" task higher in the file because the new gulp version requires referenced tasks to be defined before they're referenced
  • I also had to upgrade gulp-cache to get it to work
  • Note that there are some style changes that were added automatically by husky (pretty-quick --staged") when I committed the change.
• Generated the package-lock.json by using npm verson 8. The latest version of npm has a new, different format for the lockfile (lockfileVersion 2)
• Upgraded husky, since npx husky install wasn't working
• Ran npm audit fix to automatically fix any vulnerabilities that could be fixed without any breaking changes