fix slack-sdk issue (#2969)

<img width="1488" alt="Screenshot 2023-09-05 at 12 59 16"
src="https://github.com/grafana/oncall/assets/9406895/61518425-da47-4363-8400-fc46b043f64f">


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CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## v1.3.34 (2023-09-05)
+
+### Fixed
+
+- Fix issue in `apps.slack.tasks.populate_slack_channels_for_team` task by @joeyorlando ([#2969](https://github.com/grafana/oncall/pull/2969))
+
 ## v1.3.33 (2023-09-05)
 
 ### Fixed

engine/apps/slack/tasks.py

@@ -540,11 +540,9 @@ def populate_slack_channels_for_team(slack_team_identity_id: int, cursor: Option
         response, cursor, rate_limited = sc.paginated_api_call_with_ratelimit(
             "conversations_list",
             paginated_key="channels",
-            json={
-                "types": "public_channel,private_channel",
-                "limit": 1000,
-                "cursor": cursor,
-            },
+            types="public_channel,private_channel",
+            limit=1000,
+            cursor=cursor,
         )
     except SlackAPITokenException as e:
         logger.info(f"token revoked\n{e}")