DEV: Upgrade Markdown.it to v13.0.1 (#17099)

Updates markdown-it to v13.0.1

Noteworthy changes:
* `markdownit()` is now available on `globalThis` instead of `window`.

* The `text_collapse` rule was renamed to `fragments_join` which affected the `bbcode-inline` implementation.

* The `linkify` rule was added to the `inline` chain which affected the handling of the `[url]` BBCode. If available, our implementation reuses `link_open` and `link_close` tokens created by linkify in order to prevent duplicate links.

* The rendered HTML for code changed slightly. There's now a linebreak before the `</code>` tag. The tests were adjusted accordingly.

package.json

@@ -7,11 +7,10 @@
   "license": "GPL-2.0-only",
   "dependencies": {
     "@discourse/itsatrap": "^2.0.10",
-    "@fortawesome/fontawesome-free": "5.15.4",
     "@discourse/moment-timezone-names-translations": "^1.0.0",
+    "@fortawesome/fontawesome-free": "5.15.4",
     "@highlightjs/cdn-assets": "^10.7.0",
     "@json-editor/json-editor": "^2.6.1",
-    "tippy.js": "^6.3.7",
     "@popperjs/core": "v2.10.2",
     "@uppy/aws-s3": "^2.0.8",
     "@uppy/aws-s3-multipart": "^2.2.1",
@@ -29,10 +28,11 @@
     "handlebars": "^4.7.7",
     "jquery": "3.5.1",
     "magnific-popup": "1.1.0",
-    "markdown-it": "10.0.0",
+    "markdown-it": "13.0.1",
     "moment": "2.29.2",
     "moment-timezone": "0.5.31",
     "pikaday": "1.8.0",
+    "tippy.js": "^6.3.7",
     "workbox-cacheable-response": "^4.3.1",
     "workbox-core": "^4.3.1",
     "workbox-expiration": "^4.3.1",