chore(deps): bump the astro group across 1 directory with 6 updates

Bumps the astro group with 6 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) | `2.3.1` | `3.1.3` |
| [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap) | `3.1.4` | `3.1.6` |
| [@astrojs/svelte](https://github.com/withastro/astro/tree/HEAD/packages/integrations/svelte) | `5.4.0` | `5.7.0` |
| [@astrojs/vercel](https://github.com/withastro/astro/tree/HEAD/packages/integrations/vercel) | `7.5.4` | `7.7.2` |
| [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) | `4.7.1` | `4.12.2` |
| [@astrojs/check](https://github.com/withastro/language-tools/tree/HEAD/packages/astro-check) | `0.5.10` | `0.8.3` |



Updates `@astrojs/mdx` from 2.3.1 to 3.1.3
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/mdx)

Updates `@astrojs/sitemap` from 3.1.4 to 3.1.6
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/sitemap/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/sitemap)

Updates `@astrojs/svelte` from 5.4.0 to 5.7.0
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/svelte/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/svelte)

Updates `@astrojs/vercel` from 7.5.4 to 7.7.2
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/vercel/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/vercel)

Updates `astro` from 4.7.1 to 4.12.2
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/[email protected]/packages/astro)

Updates `@astrojs/check` from 0.5.10 to 0.8.3
- [Release notes](https://github.com/withastro/language-tools/releases)
- [Changelog](https://github.com/withastro/language-tools/blob/main/packages/astro-check/CHANGELOG.md)
- [Commits](https://github.com/withastro/language-tools/commits/@astrojs/[email protected]/packages/astro-check)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: astro
- dependency-name: "@astrojs/sitemap"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: astro
- dependency-name: "@astrojs/svelte"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: "@astrojs/vercel"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: astro
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: "@astrojs/check"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: astro
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -16,21 +16,21 @@
     "playwright": "playwright"
   },
   "dependencies": {
-    "@astrojs/mdx": "2.3.1",
-    "@astrojs/sitemap": "3.1.4",
-    "@astrojs/svelte": "^5.4.0",
-    "@astrojs/vercel": "^7.5.4",
+    "@astrojs/mdx": "3.1.3",
+    "@astrojs/sitemap": "3.1.6",
+    "@astrojs/svelte": "^5.7.0",
+    "@astrojs/vercel": "^7.7.2",
     "@unocss/astro": "0.59.4",
     "@vercel/speed-insights": "^1.0.9",
-    "astro": "4.7.1",
+    "astro": "4.12.2",
     "astro-compress": "2.2.9",
     "nanostores": "^0.9.5",
     "svelte": "^4.2.12",
     "typescript": "^5.4.5",
     "unocss": "0.59.4"
   },
   "devDependencies": {
-    "@astrojs/check": "^0.5.10",
+    "@astrojs/check": "^0.8.3",
     "@axe-core/playwright": "^4.8.4",
     "@iconify-json/carbon": "^1.1.31",
     "@iconify-json/game-icons": "^1.1.7",