[integ-tests] Use t3.large for Network Bastion

t3.large is available in more regions than c5.large (e.g. c5.large is not available in KUL region).

Signed-off-by: Hanwen <[email protected]>

Author: hanwen-cluster

tests/integration-tests/network_template_builder.py

@@ -31,7 +31,7 @@
 from utils import get_arn_partition
 
 TAGS_PREFIX = "ParallelCluster"
-BASTION_INSTANCE_TYPE = "c5.large"
+BASTION_INSTANCE_TYPE = "t3.large"
 
 
 class Gateways(Enum):