qunitjs / qunit / #2920

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Build: Update dev dependencies

* Keep the `execa` and `fixturify` dev dependencies pinned for now.
  These are simple, stable, and do exactly what we need.

* `grunt-contrib-connect`: Major version to require Node 10+.

* `grunt-contrib-qunit`: Major version to require Node 10+ and using
  a newer version of Puppeteer (and Chromium).

* `@rollup/plugin-replace`: Address deprecation warning about
  preventAssignment, which currently defaults to false, but will
  become true in a future release. It recommends setting to true now,
  which I did. We don't use this in assignments.

Given that this update affects Babel and Rollup, I've also done an
early run of `node build/review-package.js 2.14.1` to see if there
are any changes we may want to know about. What I noticed:

* File comments from imported libs are preserved now
  (affects promise-polyfill and fuzzysort).

* The createCommonjsModule() function has become much simpler,
  removing parts that we weren't using.

* The embedded copy of fuzzysort changed to remove an unused variable
  that Rollup is now able to find.
  Ref https://github.com/farzher/fuzzysort/pull/82

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