⬆️ Bump @next/mdx from 12.2.5 to 12.3.0

Bumps [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) from 12.2.5 to 12.3.0.
- [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/v12.3.0/packages/next-mdx)

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

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

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "@mdx-js/loader": "^2.1.3",
     "@mdx-js/react": "^2.1.3",
-    "@next/mdx": "^12.2.5",
+    "@next/mdx": "^12.3.0",
     "@quri/squiggle-components": "^0.4.1",
     "next": "12.3.0",
     "react": "18.2.0",

yarn.lock

@@ -233,10 +233,10 @@
   dependencies:
     glob "7.1.7"
 
-"@next/mdx@^12.2.5":
-  version "12.2.5"
-  resolved "https://registry.yarnpkg.com/@next/mdx/-/mdx-12.2.5.tgz#f88743cad222c53bf1648ce15d22e9a49a4c5bc4"
-  integrity sha512-b4gDNNvlt1Icf9D+nMzc66Tn1ei4lYRUFjwjWdCgdQFCo2ahKl+/f4R/g958KGzZMFmmXBJ7JIfzeAqgPv7TsA==
+"@next/mdx@^12.3.0":
+  version "12.3.0"
+  resolved "https://registry.yarnpkg.com/@next/mdx/-/mdx-12.3.0.tgz#ba6a1d27f0ef9b46b00e09ca0b514787abdf5b81"
+  integrity sha512-XyzLhgsKa4lKb3dw8HFtj4MM0jilDStKtosFrkt8AX44zEwxPoJPaIvMCWNsRwq72YTzQLqh1gjepIe9zCKZwQ==
 
 "@next/swc-android-arm-eabi@12.3.0":
   version "12.3.0"