fix: update @graphprotocol/graph-ts to version ^0.38.0 in package.json and package-lock.json

Author: Le-Caignec

packages/subgraph/package-lock.json

@@ -17,7 +17,7 @@
   },
   "dependencies": {
     "@graphprotocol/graph-cli": "^0.96.0",
-    "@graphprotocol/graph-ts": "0.35.1",
+    "@graphprotocol/graph-ts": "^0.38.0",
     "@iexec/dataprotector-environments": "file:../../environments",
     "@iexec/poco": "^5.3.0",
     "matchstick-as": "^0.6.0"