Bump @next/mdx from 13.4.13 to 13.4.19

Bumps [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) from 13.4.13 to 13.4.19.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v13.4.19/packages/next-mdx)

---
updated-dependencies:
- dependency-name: "@next/mdx"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

sites/shared/package.json

@@ -17,7 +17,7 @@
   "peerDependencies": {},
   "dependencies": {
     "@headlessui/react": "1.7.16",
-    "@next/mdx": "13.4.13",
+    "@next/mdx": "13.4.19",
     "@resvg/resvg-js": "2.4.1",
     "@tailwindcss/typography": "0.5.9",
     "Buffer": "0.0.0",

yarn.lock

@@ -1481,10 +1481,10 @@
   dependencies:
     glob "7.1.7"
 
-"@next/mdx@13.4.13":
-  version "13.4.13"
-  resolved "https://registry.yarnpkg.com/@next/mdx/-/mdx-13.4.13.tgz#e2e4d73c4d00cd9ced8f4c47805d8a3784e36c18"
-  integrity sha512-rQHfeyPO6WC+mEqFCNibV8CWXBJ95uRfPv05Xb8ZMUr284grCIAaSfSRDDrwcoknizyfREDp33oV/isIujS4pA==
+"@next/mdx@13.4.19":
+  version "13.4.19"
+  resolved "https://registry.yarnpkg.com/@next/mdx/-/mdx-13.4.19.tgz#6c7c0c2cdd14fc728afa3336805bc8c8428d2b31"
+  integrity sha512-EaWA30YxAqFcyQYNxCoL9/TCcZP1Nk6pvW0vf1M54qDAkAGiloWQqyttVKVbRz+qOYk92he6mBB4ej/7pmEinQ==
   dependencies:
     source-map "^0.7.0"