toulouse-maelis: allow using site_service with other test fixture (#73808)

tests/test_toulouse_maelis.py

@@ -100,13 +100,15 @@ def invoice_service(requests_mock):
 
 
 @pytest.fixture()
-def site_service():
-    with ResponsesSoap(
+def site_service(requests_mock):
+    responses_soap = ResponsesSoap(
         wsdl_url='https://example.org/SiteService?wsdl',
         wsdl_content=get_xml_file('SiteService.wsdl'),
         settings=Settings(strict=False, xsd_ignore_sequence_order=True),
-    )() as mock:
-        yield mock
+        requests_mock=requests_mock,
+    )
+    with responses_soap() as soap_mock:
+        yield soap_mock
 
 
 @pytest.fixture(scope='module')