meta: bump the mdx group with 2 updates

Bumps the mdx group with 2 updates: [sval](https://github.com/Siubaak/sval) and [twoslash](https://github.com/twoslashes/twoslash/tree/HEAD/packages/twoslash).


Updates `sval` from 0.6.9 to 0.6.12
- [Release notes](https://github.com/Siubaak/sval/releases)
- [Commits](Siubaak/sval@0.6.9...0.6.12)

Updates `twoslash` from 0.3.6 to 0.3.8
- [Release notes](https://github.com/twoslashes/twoslash/releases)
- [Commits](https://github.com/twoslashes/twoslash/commits/v0.3.8/packages/twoslash)

---
updated-dependencies:
- dependency-name: sval
  dependency-version: 0.6.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mdx
- dependency-name: twoslash
  dependency-version: 0.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mdx
...

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

Author: dependabot[bot]

apps/site/package.json

@@ -69,9 +69,9 @@
     "remark-gfm": "~4.0.1",
     "remark-reading-time": "~2.1.0",
     "semver": "~7.7.4",
-    "sval": "^0.6.9",
+    "sval": "^0.6.12",
     "tailwindcss": "catalog:",
-    "twoslash": "^0.3.6",
+    "twoslash": "^0.3.8",
     "typescript": "catalog:",
     "unist-util-visit": "^5.1.0",
     "vfile": "~6.0.3",