fix: pin @stripe/stripe-js to v3.5.0, last version with redirectToCheckout

v4+ removed the redirectToCheckout API. v3.5.0 was the last known
working version before the dependency upgrade in 0525598.

Author: razzeee

package.json

@@ -34,7 +34,7 @@
     "@aws-sdk/lib-dynamodb": "^3.1019.0",
     "@base-ui/react": "^1.3.0",
     "@heroicons/react": "^2.2.0",
-    "@stripe/stripe-js": "^9.0.0",
+    "@stripe/stripe-js": "^3.5.0",
     "@tailwindcss/typography": "^0.5.19",
     "astro": "^6.1.1",
     "class-variance-authority": "^0.7.1",