Slack-Alerts failing possibly due to upgrade to Python 3

[mcsclimenti]

Describe the bug

When attempting to send alerts to Slack the alert will never send it to Slack. This began after the upgrade to Splunk Cloud
Version: 9.2.2403.108 Build: 918af2204023. I believe it might be related to Python which I believe was upgraded from version 2 to version 3.

A list of the errors is below:

09-11-2024 03:33:32.232 +0000 WARN sendmodalert [2987359 AlertNotifierWorker-0] - action=slack - Alert action script returned error code=1

09-11-2024 03:33:32.232 +0000 INFO sendmodalert [2987359 AlertNotifierWorker-0] - action=slack - Alert action script completed in duration=168 ms with exit code=1

09-11-2024 03:33:32.224 +0000 FATAL sendmodalert [2987359 AlertNotifierWorker-0] - action=slack STDERR - Alert action failed

09-11-2024 03:33:32.224 +0000 INFO sendmodalert [2987359 AlertNotifierWorker-0] - action=slack STDERR - Slack API responded with HTTP status=200

09-11-2024 03:33:32.224 +0000 INFO sendmodalert [2987359 AlertNotifierWorker-0] - action=slack STDERR - Using configured Slack App OAuth token: REDACTED

09-11-2024 03:33:32.224 +0000 INFO sendmodalert [2987359 AlertNotifierWorker-0] - action=slack STDERR - Running python 3
To Reproduce
Steps to reproduce the behavior:

1. Configure alert to use Slack App Integration

Expected behavior
Send the alert to Slack

Screenshots
See above for errors

Splunk Environment:

• Splunk Version: Splunk Cloud version 9.2.2403.108 Build: 918af2204023
• OS: [eg. Linux, MacOS, Windows]
• Cloud: [yes if Splunk Cloud, no if self-hosted] yes

Client Environment: (if it's a UI issue)

• Browser Type: [eg. Brave, Chrome, Firefox]
• OS: [eg. Windows, MacOS]

Additional context
Add any other context about the problem here.