Update tween.js dependency

[jjhembd]

The latest major version of tween.js results in build warnings:

  Build/Cesium/Cesium.js  3.7mb ⚠️
⚡ Done in 1556ms
▲ [WARNING] Import "Easing" will always be undefined because the file "node_modules/@tweenjs/tween.js/dist/tween.cjs.js" has no exports [import-is-undefined]
    packages/engine/Source/Core/EasingFunction.js:1:9:
      1 │ import { Easing } from "@tweenjs/tween.js";
        ╵          ~~~~~~
▲ [WARNING] Import "Tween" will always be undefined because the file "node_modules/@tweenjs/tween.js/dist/tween.cjs.js" has no exports [import-is-undefined]
    packages/engine/Source/Scene/TweenCollection.js:8:9:
      8 │ import { Tween as TweenJS } from "@tweenjs/tween.js";
        ╵          ~~~~~

These warnings will need to be resolved before updating the dependency.

[ggetz]

Based on the docs, it looks like we'd want to make sure the import points to tween.es.js.