fix: Add deprecation warnings to Steps from Apps methods (#1504)

* Added deprecation warnings for workflow step deprecation

* Update format

slack_sdk/web/deprecation.py

@@ -12,6 +12,8 @@
 
 deprecated_method_prefixes_2023_07 = ["stars."]
 
+deprecated_method_prefixes_2024_09 = ["workflows.stepCompleted", "workflows.updateStep", "workflows.stepFailed"]
+
 
 def show_deprecation_warning_if_any(method_name: str):
     """Prints a warning if the given method is deprecated"""
@@ -40,3 +42,12 @@ def show_deprecation_warning_if_any(method_name: str):
             "https://api.slack.com/changelog/2023-07-its-later-already-for-stars-and-reminders"
         )
         warnings.warn(message)
+
+    # 2024/09 workflow steps API deprecation
+    matched_prefixes = [prefix for prefix in deprecated_method_prefixes_2024_09 if method_name.startswith(prefix)]
+    if len(matched_prefixes) > 0:
+        message = (
+            f"{method_name} is deprecated. For more info, go to "
+            "https://api.slack.com/changelog/2023-08-workflow-steps-from-apps-step-back"
+        )
+        warnings.warn(message)

tests/slack_sdk/web/test_web_client_workflow_step_deprecation.py

@@ -0,0 +1,35 @@
+import unittest
+import pytest
+
+from slack_sdk.web import WebClient
+from tests.helpers import remove_os_env_temporarily, restore_os_env
+from tests.slack_sdk.web.mock_web_api_server import (
+    setup_mock_web_api_server,
+    cleanup_mock_web_api_server,
+)
+
+
+class TestWebClient(unittest.TestCase):
+    def setUp(self):
+        setup_mock_web_api_server(self)
+        self.env_values = remove_os_env_temporarily()
+
+    def tearDown(self):
+        cleanup_mock_web_api_server(self)
+        restore_os_env(self.env_values)
+
+    # You can enable this test to verify if the warning can be printed as expected
+    @pytest.mark.skip()
+    def test_workflow_step_completed_deprecation(self):
+        client = WebClient(base_url="http://localhost:8888")
+        client.workflows_stepCompleted(token="xoxb-api_test", workflow_step_execute_id="W1234")
+
+    @pytest.mark.skip()
+    def test_workflow_step_failed_deprecation(self):
+        client = WebClient(base_url="http://localhost:8888")
+        client.workflows_stepFailed(token="xoxb-api_test", workflow_step_execute_id="W1234", error={})
+
+    @pytest.mark.skip()
+    def test_workflow_update_step_deprecation(self):
+        client = WebClient(base_url="http://localhost:8888")
+        client.workflows_updateStep(token="xoxb-api_test", workflow_step_edit_id="W1234", inputs={}, outputs={})