fix(deps): update react monorepo to v19

Author: renovate[bot]

package.json

@@ -15,8 +15,8 @@
     "gray-matter": "^4.0.3",
     "next": "^14.2.20",
     "next-themes": "^0.4.0",
-    "react": "^18",
-    "react-dom": "^18",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-icons": "^4.12.0",
     "react-markdown": "^9.0.1",
     "react-snowfall": "^2.2.0",
@@ -33,8 +33,8 @@
   "devDependencies": {
     "@fullhuman/postcss-purgecss": "^6.0.0",
     "@types/node": "^20",
-    "@types/react": "^18",
-    "@types/react-dom": "^18",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@types/react-syntax-highlighter": "^15.5.11",
     "@vercel/analytics": "^1.2.2",
     "@vercel/speed-insights": "^1.0.10",