[CI] Increate the timeout limit for benchmark test (#95787)

Summary: xcit_large_24_p8_224 occasionally hits TIMEOUT on CI. Bump up
the limit to reduce flakiness.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/95787
Approved by: https://github.com/ezyang, https://github.com/ZainRizvi
diff --git a/benchmarks/dynamo/common.py b/benchmarks/dynamo/common.py
index a6f4011..88ca3ff 100644
--- a/benchmarks/dynamo/common.py
+++ b/benchmarks/dynamo/common.py
@@ -1753,8 +1753,8 @@
     parser.add_argument(
         "--timeout",
         type=int,
-        default=1200,
-        help="timeout (ms) for benchmarking.",
+        default=1800,
+        help="timeout (second) for benchmarking.",
     )
 
     parser.add_argument(