qa/suites/orch/cephadm/workunits/task/test_iscsi_container: switch to centos 9

Centos 8 went end of life (see https://docs.ceph.com/en/latest/start/os-recommendations/#platforms),
so we will now test on centos 9 for quincy.

Signed-off-by: Laura Flores <lflores@ibm.com>

diff --git a/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_8.stream_container_tools.yaml b/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_8.stream_container_tools.yaml
deleted file mode 120000 (symlink)
index 7a86f96..0000000
--- a/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_8.stream_container_tools.yaml
+++ /dev/null
@@ -1 +0,0 @@
-.qa/distros/podman/centos_8.stream_container_tools.yaml
\ No newline at end of file

diff --git a/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_9.stream.yaml b/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_9.stream.yaml
new file mode 120000 (symlink)
index 0000000..dca92dd
--- /dev/null
+++ b/qa/suites/orch/cephadm/workunits/task/test_iscsi_container/centos_9.stream.yaml
@@ -0,0 +1 @@
+.qa/distros/podman/centos_9.stream.yaml
\ No newline at end of file