📝 Document expired domain for test

It's okay - we don't need to re-record this cassette anyway. As long as
'we verify that the WSDL can be parsed and used correctly, we're good.

.github/ISSUE_TEMPLATE/prepare-release.md

@@ -24,7 +24,6 @@ assignees: sergei-maertens
     - [ ] `openforms.contrib.haal_centraal.tests.test_integration`
     - [ ] `openforms.contrib.kvk`
     - [ ] `openforms.contrib.objects_api.tests`
-    - [ ] `soap.tests.test_client`
     - `suwinet.tests.test_client` (testenv access has been retracted and won't be reinstated)
   - Forms
     - [ ] `openforms.forms.tests.test_import_export`

src/soap/tests/test_client.py

@@ -229,6 +229,10 @@ def test_default_behaviour_relative_paths(self, m):
         self.assertEqual(m.last_request.url, "https://example.com/api/relative")
 
     def test_it_can_build_a_functional_client(self):
+        # NOTE - soapclient.com no longer exists so we can't re-record these
+        # cassettes. That's not a problem, as we mostly check that the WSDL processing
+        # works as expected and it's not a real service that we talk to that may break
+        # our application.
         service = SoapServiceFactory.build(
             url="http://www.soapclient.com/xml/soapresponder.wsdl"
         )