build: update astro to v5.9.0

changes in astro.config.ts according to https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md#upgrading

Author: fre-ben

astro.config.ts

@@ -30,10 +30,9 @@ export default defineConfig({
   image: {
     // Used for all Markdown images; not configurable per-image
     // Used for all `<Image />` and `<Picture />` components unless overridden with a prop
-    experimentalLayout: "responsive",
+    experimentalLayout: "constrained",
   },
   experimental: {
-    svg: true,
     responsiveImages: true,
     preserveScriptOrder: true,
   },

package.json

@@ -14,11 +14,11 @@
     "lint": "eslint ."
   },
   "dependencies": {
-    "@astrojs/rss": "^4.0.11",
-    "@astrojs/sitemap": "^3.2.1",
+    "@astrojs/rss": "^4.0.12",
+    "@astrojs/sitemap": "^3.4.1",
     "@resvg/resvg-js": "^2.6.2",
     "@tailwindcss/vite": "^4.0.14",
-    "astro": "^5.5.2",
+    "astro": "^5.9.0",
     "dayjs": "^1.11.13",
     "lodash.kebabcase": "^4.1.1",
     "remark-collapse": "^0.1.2",