Update typescript version

The previous ^-based version installed 5.2.x automatically, but some changes in 5.2 break the build. I have updated this to explicitly install the latest 5.1 version, one that I have confirmed to work

package.json

@@ -45,6 +45,6 @@
     "eslint": "^8.40.0",
     "nodemon": "^2.0.22",
     "prettier": "^2.8.8",
-    "typescript": "^5.0.4"
+    "typescript": "5.1.6"
   }
 }