Bump the astro group with 3 updates

Bumps the astro group with 3 updates: [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx), [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap) and [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `@astrojs/mdx` from 2.0.4 to 2.0.5
- [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 3.0.4 to 3.0.5
- [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 `astro` from 4.1.2 to 4.2.1
- [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)

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

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

package.json

@@ -7,10 +7,10 @@
   },
   "dependencies": {
     "@astro-community/astro-embed-twitter": "^0.5.3",
-    "@astrojs/mdx": "^2.0.4",
+    "@astrojs/mdx": "^2.0.5",
     "@astrojs/react": "^3.0.9",
     "@astrojs/rss": "^4.0.2",
-    "@astrojs/sitemap": "^3.0.4",
+    "@astrojs/sitemap": "^3.0.5",
     "@astrojs/tailwind": "^5.1.0",
     "@fortawesome/fontawesome-free": "^6.5.1",
     "@fortawesome/fontawesome-svg-core": "^6.5.1",
@@ -19,7 +19,7 @@
     "@fortawesome/free-solid-svg-icons": "^6.5.1",
     "@fortawesome/react-fontawesome": "^0.2.0",
     "@mdx-js/react": "^3.0.0",
-    "astro": "^4.1.2",
+    "astro": "^4.2.1",
     "astro-google-analytics": "^1.0.3",
     "clsx": "^2.1.0",
     "date-fns": "^3.2.0",