Build/Test Tools: Update/Audit NPM dependencies for 5.9.

This updates several NPM dependencies to their latest (or latest allowed) versions.

- `autoprefixer` from `9.8.6` to `9.8.8`
- `chalk` from `4.1.1` to `4.1.2`
- `grunt-contrib-concat` from `1.0.1` to `2.0.0`
- `grunt-contrib-jshint` from `3.0.0` to `3.1.1`
- `grunt-contrib-qunit` from `4.0.0` to `5.1.1`
- `qunit` from `2.16.0` to `2.17.2`
- `sass` from `1.34.1` to `1.43.4`
- `sinon` from `11.1.1` to `12.0.1`
- `sinon-test` from `3.1.0` to `3.1.1`
- `uglify-js` from `3.13.9` to `3.14.3`
- `wait-on` from `5.3.0` to `6.0.0`

This change also contains several updates to the `package-lock.json` file made by running `npm audit fix`.

See #53361.
Built from https://develop.svn.wordpress.org/trunk@52046


git-svn-id: http://core.svn.wordpress.org/trunk@51638 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52045';
+$wp_version = '5.9-alpha-52046';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.