style: codegen without changing legacy client

Author: zimeg

scripts/codegen.py

@@ -119,7 +119,7 @@
         legacy_source,
     )
     legacy_source = re.sub(r"= WebClient\(", "= LegacyWebClient(", legacy_source)
-    legacy_source = re.sub(r"from slack_sdk.web.chat_stream import ChatStream", "", legacy_source)
+    legacy_source = re.sub(r"^from slack_sdk.web.chat_stream import ChatStream\n", "", legacy_source, flags=re.MULTILINE)
     legacy_source = re.sub(r"(?s)def chat_stream.*?(?=def)", "", legacy_source)
     with open(f"{args.path}/slack_sdk/web/legacy_client.py", "w") as output:
         output.write(legacy_source)

slack_sdk/web/legacy_client.py

@@ -21,7 +21,6 @@
 import slack_sdk.errors as e
 from slack_sdk.models.views import View
 
-
 from ..models.attachments import Attachment
 from ..models.blocks import Block
 from ..models.metadata import Metadata