This updates the following `devDependencies` to newer versions:
- `dotenv` from `16.0.0` to `16.0.1`.
- `grunt` from `1.5.2` to `1.5.3`.
- `grunt-contrib-qunit` from `6.0.0` to `6.2.0`.
- `grunt-contrib-uglify` from `5.2.1` to `5.2.2`.
- `qunit` from `2.18.2` to `2.19.1`.
- `sass` from `1.51.0` to `1.53.0`.
- `sinon` from `13.0.2` to `14.0.0`.
- `uglify-js` from `3.15.4` to `3.16.1`.
Additionally, `npm audit fix` has been run to update dependencies with vulnerabilities.
See #55652.
Built from https://develop.svn.wordpress.org/trunk@53580
git-svn-id: http://core.svn.wordpress.org/trunk@53169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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