bump: update astro to version 5.12.0 and related dependencies (#563)

- Updated astro from 5.11.0 to 5.12.0 in package.json and pnpm-lock.yaml.
- Upgraded @astrojs/markdown-remark from 6.3.2 to 6.3.3.
- Updated smol-toml from 1.3.1 to 1.4.1.
- Updated semver from 7.7.1 to 7.7.2.

Author: satnaing

package.json

@@ -17,7 +17,7 @@
     "@astrojs/sitemap": "^3.4.1",
     "@resvg/resvg-js": "^2.6.2",
     "@tailwindcss/vite": "^4.1.11",
-    "astro": "^5.11.0",
+    "astro": "^5.12.0",
     "dayjs": "^1.11.13",
     "lodash.kebabcase": "^4.1.1",
     "remark-collapse": "^0.1.2",