specify prisma version

Author: Peyton-McKee

src/backend/package.json

@@ -9,7 +9,7 @@
     "prisma:manual": "ts-node ./src/prisma/manual.ts"
   },
   "dependencies": {
-    "@prisma/client": "^6.2.1",
+    "@prisma/client": "6.2.1",
     "@slack/events-api": "^3.0.1",
     "@slack/web-api": "^7.8.0",
     "@types/concat-stream": "^2.0.0",