chore: make create_jwt() test more picky

Be more precise in the definition of the expected HTTP request: check the
payload contains the expected values.

Author: agateau-gg

tests/test_client.py

@@ -751,6 +751,14 @@ def test_create_jwt(
     """
     mock_response = responses.post(
         url=client._url_from_endpoint("auth/jwt", "v1"),
+        match=[
+            matchers.json_params_matcher(
+                {
+                    "audience": "dummy_audience",
+                    "audience_type": "hmsl",
+                }
+            )
+        ],
         content_type="application/json",
         status=200,
         json={"token": "dummy_token"},