deps: bump the production-deps group across 1 directory with 2 updates

Bumps the production-deps group with 2 updates in the / directory: [@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/sitemap` from 3.7.2 to 3.7.3
- [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/sitemap@3.7.3/packages/integrations/sitemap)

Updates `astro` from 6.4.2 to 6.4.4
- [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/astro@6.4.4/packages/astro)

---
updated-dependencies:
- dependency-name: "@astrojs/sitemap"
  dependency-version: 3.7.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-deps
- dependency-name: astro
  dependency-version: 6.4.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-deps
...

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

Author: dependabot[bot]

package-lock.json

@@ -20,8 +20,8 @@
   "dependencies": {
     "@astrojs/mdx": "^5.0.6",
     "@astrojs/rss": "^4.0.18",
-    "@astrojs/sitemap": "^3.7.2",
-    "astro": "^6.3.3",
+    "@astrojs/sitemap": "^3.7.3",
+    "astro": "^6.4.4",
     "lucide-astro": "^0.556.0",
     "rehype-autolink-headings": "^7.1.0",
     "rehype-slug": "^6.0.0",