ci: run weekly check with latest svelte versions

Author: mcous

.github/workflows/release.yml

@@ -5,6 +5,9 @@ on:
     branches: [main, next]
   pull_request:
     branches: [main, next]
+  schedule:
+    # Tuesdays at 14:45 UTC (10:45 EST)
+    - cron: 45 14 * * 1
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}