fix: resolve all 6 prefer-const eslint errors for CI

memento-note/app/api/notes/route.ts

@@ -20,7 +20,7 @@ export async function GET(request: NextRequest) {
     const notebookId = searchParams.get('notebookId')
     const limit = searchParams.get('limit') ? parseInt(searchParams.get('limit')!) : undefined
 
-    let where: any = {
+    const where: any = {
       userId: session.user.id,
       trashedAt: null
     }