workbox-build 7.1 contains breaking changes

**Library Affected**:
workbox-build

**Browser & Platform**:
Using Vite 2, but could apply to other cases too

**Issue or Feature Request Description**:

> 'Insufficient rollup version: "@rollup/plugin-node-resolve" requires at least rollup@2.78.0 but found rollup@2.77.3.

Vite v2.x has `"rollup": ">=2.59.0 <2.78.0"`:
https://github.com/vitejs/vite/blob/59363526015bcfc191d5839b5889d73df7f84373/packages/vite/package.json#L49

So, any Vite 2 user won't be able to use 7.1.0, 7.1.1, or anything that may come after, if this is not addressed.