meta: bump the mdx group with 6 updates

Bumps the mdx group with 6 updates:

| Package | From | To |
| --- | --- | --- |
| [@shikijs/core](https://github.com/shikijs/shiki/tree/HEAD/packages/core) | `3.19.0` | `3.20.0` |
| [@shikijs/engine-javascript](https://github.com/shikijs/shiki/tree/HEAD/packages/engine-javascript) | `3.19.0` | `3.20.0` |
| [@shikijs/engine-oniguruma](https://github.com/shikijs/shiki/tree/HEAD/packages/engine-oniguruma) | `3.19.0` | `3.20.0` |
| [@shikijs/twoslash](https://github.com/shikijs/shiki/tree/HEAD/packages/twoslash) | `3.19.0` | `3.20.0` |
| [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki) | `3.19.0` | `3.20.0` |
| [sval](https://github.com/Siubaak/sval) | `0.6.7` | `0.6.8` |


Updates `@shikijs/core` from 3.19.0 to 3.20.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.20.0/packages/core)

Updates `@shikijs/engine-javascript` from 3.19.0 to 3.20.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.20.0/packages/engine-javascript)

Updates `@shikijs/engine-oniguruma` from 3.19.0 to 3.20.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.20.0/packages/engine-oniguruma)

Updates `@shikijs/twoslash` from 3.19.0 to 3.20.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.20.0/packages/twoslash)

Updates `shiki` from 3.19.0 to 3.20.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Commits](https://github.com/shikijs/shiki/commits/v3.20.0/packages/shiki)

Updates `sval` from 0.6.7 to 0.6.8
- [Release notes](https://github.com/Siubaak/sval/releases)
- [Commits](Siubaak/sval@0.6.7...0.6.8)

---
updated-dependencies:
- dependency-name: "@shikijs/core"
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mdx
- dependency-name: "@shikijs/engine-javascript"
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mdx
- dependency-name: "@shikijs/engine-oniguruma"
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mdx
- dependency-name: "@shikijs/twoslash"
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mdx
- dependency-name: shiki
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mdx
- dependency-name: sval
  dependency-version: 0.6.8
  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

@@ -71,7 +71,7 @@
     "remark-gfm": "~4.0.1",
     "remark-reading-time": "~2.0.2",
     "semver": "~7.7.2",
-    "sval": "^0.6.3",
+    "sval": "^0.6.8",
     "tailwindcss": "catalog:",
     "twoslash": "^0.3.4",
     "unist-util-visit": "^5.0.0",

packages/rehype-shiki/package.json

@@ -21,13 +21,13 @@
     "test:unit": "cross-env NODE_NO_WARNINGS=1 node --experimental-test-coverage --experimental-test-module-mocks --test \"**/*.test.mjs\""
   },
   "dependencies": {
-    "@shikijs/core": "^3.19.0",
-    "@shikijs/engine-javascript": "^3.19.0",
-    "@shikijs/engine-oniguruma": "^3.19.0",
-    "@shikijs/twoslash": "^3.19.0",
+    "@shikijs/core": "^3.20.0",
+    "@shikijs/engine-javascript": "^3.20.0",
+    "@shikijs/engine-oniguruma": "^3.20.0",
+    "@shikijs/twoslash": "^3.20.0",
     "classnames": "catalog:",
     "hast-util-to-string": "^3.0.1",
-    "shiki": "~3.19.0",
+    "shiki": "~3.20.0",
     "unist-util-visit": "^5.0.0"
   },
   "devDependencies": {