add timeout to contract-verify action

Author: Franziska-Mueller

.github/workflows/contract-verify.yml

@@ -20,6 +20,7 @@ on:
 jobs:
   contract_verify_job:
     runs-on: ubuntu-latest
+    timeout-minutes: 15 # Sometimes the parser can get stuck
     name: Verify smart contract files
     steps:
       # Checkout repo to use files of the repo as input for container action