Ensure credential objects come oldest first (#1258)

Given the credentials are loaded based on userId, sort is not consistent.
Without this, events are booked on whichever calendar credential is loaded first. 
813eaa83b7/lib/events/EventManager.ts (L240-L244)

Co-authored-by: Bailey Pumfleet <pumfleet@hey.com>

pages/api/book/confirm.ts

@@ -63,7 +63,9 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
     },
     select: {
       id: true,
-      credentials: true,
+      credentials: {
+        orderBy: { id: "desc" as Prisma.SortOrder },
+      },
       timeZone: true,
       email: true,
       name: true,