Increase snapshot target for 512mb VM on aarch64

Signed-off-by: Matthew Schlebusch <schlebus@amazon.com>

Author: mattschlebusch

tests/integration_tests/performance/test_snapshot_perf.py

@@ -138,7 +138,7 @@
                 },
                 "async": {
                     "2vcpu_256mb.json": {"target": 320},
-                    "2vcpu_512mb.json": {"target": 310},
+                    "2vcpu_512mb.json": {"target": 330},
                 },
             },
         }