[meta] ship only the dist

This will reduce your footprint from 300K to ~56k.

Here's your current state:

```
$ tree node_modules/qs/
node_modules/qs/
├── CHANGELOG.md
├── LICENSE.md
├── README.md
├── dist
│   └── qs.js
├── lib
│   ├── formats.js
│   ├── index.js
│   ├── parse.js
│   ├── stringify.js
│   └── utils.js
├── package.json
└── test
    ├── empty-keys-cases.js
    ├── parse.js
    ├── stringify.js
    └── utils.js
$ du -h node_modules/qs
116.0K  node_modules/qs/test
52.0K   node_modules/qs/dist
8.0K    node_modules/qs/.github
44.0K   node_modules/qs/lib
300.0K  node_modules/qs
$
```

I see you [do care about your footprint](f09cffc), but you ship your entire repo...

package.json

@@ -2,15 +2,18 @@
     "name": "qs",
     "description": "A querystring parser that supports nesting and arrays, with a depth limit",
     "homepage": "https://github.com/ljharb/qs",
-    "version": "6.12.1",
+    "version": "6.12.2",
     "repository": {
         "type": "git",
         "url": "https://github.com/ljharb/qs.git"
     },
     "funding": {
         "url": "https://github.com/sponsors/ljharb"
     },
-    "main": "lib/index.js",
+    "files": [
+        "dist"
+    ],
+    "main": "dist/qs.js",
     "sideEffects": false,
     "contributors": [
         {