Fix linting (#2264)

Author: sjrl

integrations/meta_llama/tests/test_llama_chat_generator.py

@@ -88,7 +88,7 @@ def test_init_default(self, monkeypatch):
 
     def test_init_fail_wo_api_key(self, monkeypatch):
         monkeypatch.delenv("LLAMA_API_KEY", raising=False)
-        with pytest.raises(ValueError, match="None of the .* environment variables are set"):
+        with pytest.raises(ValueError, match=r"None of the .* environment variables are set"):
             MetaLlamaChatGenerator()
 
     def test_init_with_parameters(self):
@@ -207,7 +207,7 @@ def test_from_dict_fail_wo_env_var(self, monkeypatch):
                 },
             },
         }
-        with pytest.raises(ValueError, match="None of the .* environment variables are set"):
+        with pytest.raises(ValueError, match=r"None of the .* environment variables are set"):
             MetaLlamaChatGenerator.from_dict(data)
 
     def test_run(self, chat_messages, mock_chat_completion, monkeypatch):  # noqa: ARG002