vmware/test: add vsphere-automation-sdk dep

The following modules depend on `vSphere Automation SDK`:

- `vmware_rest_client`
- `vmware_guest_info`
- `vmware_tag_manager`
- `vmware_vm_inventory`

The associated test cannot be run with `govcsim`. But the situation is
changing since we will soon run them on a regular lab, and so, we
need to install the dependency.

Bumping the default-test-container version to 1.9.3 to get a fresh version
of pip and requests.

Depends-On: https://github.com/ansible/ansible/pull/62412

test/lib/ansible_test/_data/requirements/integration.cloud.vcenter.txt

@@ -1 +1,2 @@
 pyvmomi
+git+https://github.com/vmware/vsphere-automation-sdk-python.git