update github runner for enclave

Author: Sneh1999

.github/workflows/espresso-enclave.yaml

@@ -13,7 +13,7 @@ permissions:
 
 jobs:
   enclave-tests-on-ec2:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-8core
     timeout-minutes: 40
 
     steps: