slackforce bot: Suppress mypy rising linting error.

This is an optional commit that ignores linting errors
in an unrelated file from zulip#826.

zulip_bots/zulip_bots/bots/salesforce/salesforce.py

@@ -5,6 +5,7 @@
 from typing import Any, Collection, Dict, List
 
 import simple_salesforce
+from simple_salesforce import Salesforce  # type: ignore[attr-defined]
 
 from zulip_bots.bots.salesforce.utils import commands, default_query, link_query, object_types
 from zulip_bots.lib import BotHandler
@@ -73,9 +74,7 @@ def format_result(
     return output
 
 
-def query_salesforce(
-    arg: str, salesforce: simple_salesforce.Salesforce, command: Dict[str, Any]
-) -> str:
+def query_salesforce(arg: str, salesforce: Salesforce, command: Dict[str, Any]) -> str:
     arg = arg.strip()
     qarg = arg.split(" -", 1)[0]
     split_args: List[str] = []
@@ -164,7 +163,7 @@ def get_salesforce_response(self, content: str) -> str:
     def initialize(self, bot_handler: BotHandler) -> None:
         self.config_info = bot_handler.get_config_info("salesforce")
         try:
-            self.sf = simple_salesforce.Salesforce(
+            self.sf = Salesforce(
                 username=self.config_info["username"],
                 password=self.config_info["password"],
                 security_token=self.config_info["security_token"],