Bump zod and @astrojs/sitemap (#6)

Bumps [zod](https://github.com/colinhacks/zod) to 3.25.76 and updates ancestor dependency [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap). These dependencies need to be updated together.


Updates `zod` from 3.21.1 to 3.25.76
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v3.21.1...v3.25.76)

Updates `@astrojs/sitemap` from 3.0.0 to 3.7.0
- [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)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 3.25.76
  dependency-type: indirect
- dependency-name: "@astrojs/sitemap"
  dependency-version: 3.7.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -13,7 +13,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/sitemap": "^3.0.0",
+    "@astrojs/sitemap": "^3.7.0",
     "@astrojs/tailwind": "^5.1.0",
     "astro": "^4.5.0",
     "gsap": "^3.12.5",