Bump openstacksdk to >1

This patch also vendors the openstack.cloud.subnet
module due to a problem with `disable_gateway_ip`
not being set for newly created subnets[1].

[1]: https://review.opendev.org/c/openstack/ansible-collections-openstack/+/940927

Change-Id: Ia021a1d7b82823c2e7498fdd66da3e2d5c6a8a79
(cherry picked from commit 8ccabb61cb8aa6a86c653cc47e43a648e8e07268)
diff --git a/roles/openstacksdk/tasks/main.yml b/roles/openstacksdk/tasks/main.yml
index 1a4c3b4..5f082a1 100644
--- a/roles/openstacksdk/tasks/main.yml
+++ b/roles/openstacksdk/tasks/main.yml
@@ -15,7 +15,7 @@
 - name: Install openstacksdk
   ansible.builtin.pip:
     name: openstacksdk
-    version: "{{ openstacksdk_version }}"
+    version: "{{ openstacksdk_version | default(omit) }}"
 
 - name: Create openstack config directory
   become: true