[integ-tests] Remove CentOS 7 (continued)

Signed-off-by: Hanwen <hanwenli@amazon.com>

Author: hanwen-cluster

tests/integration-tests/configs/develop.yaml

@@ -526,7 +526,7 @@ test-suites:
       dimensions:
         - regions: ["me-south-1"]
           instances: {{ common.INSTANCES_DEFAULT_X86 }}
-          oss: ["centos7"]
+          oss: ["alinux2"]
           schedulers: ["slurm"]
   storage:
     test_fsx_lustre.py::test_fsx_lustre: