fix: replace node built-in "util" module with "util-deprecate"

[nolanlawson]

Using the Node built-in util module can causes errors or warnings when using bundlers such as Rollup, since the module only exists in Node, not the browser. (This may require the use of something like rollup-plugin-node-builtins.)

We only need util for the util.deprecate() function, so we can rely on util-deprecate instead, which simply wraps util.deprecate() in Node as well as providing a browser-based equivalent.

[coveralls]

Coverage remained the same at 95.38% when pulling 75e38f7 on nolanlawson:util-deprecate into 56156f7 on postcss:master.

[coveralls]

Coverage remained the same at 95.38% when pulling 75e38f7 on nolanlawson:util-deprecate into 56156f7 on postcss:master.

[nolanlawson]

Per my measurements, this PR would reduce the size of postcss-selector-parser when bundled for the browser from 58570 bytes (58.6kB) to 49337 bytes (49.3 kB) – a reduction of 9.23kB or 15.8% smaller.

To test this, I just did a basic Webpack+Terser bulid:

npm i -g webpack-cli terser
webpack --mode production --entry ./dist/index.js --output /tmp/tmp.js && terser -mc < /tmp/tmp.js | wc -c

[alexander-akait]

Thanks!

[alexander-akait]

Do we need patch release?

[tedconn]

@evilebottnawi that would be great, please!