add @openzeppelin/contracts-upgradeable dependency to network-contracts

Author: teogeb

package-lock.json

@@ -44,6 +44,7 @@
     "@chainlink/contracts": "0.3.1",
     "@opengsn/contracts": "2.2.6",
     "@openzeppelin/contracts": "4.4.2",
+    "@openzeppelin/contracts-upgradeable": "4.8.0",
     "@openzeppelin/contracts-upgradeable-4.4.2": "npm:@openzeppelin/[email protected]"
   },
   "devDependencies": {