Describe the bug
Slack has deprecated the "Slack app (Classic)" bots, which prevents from adding new bridges with Slack.
See https://api.slack.com/changelog/2024-04-discontinuing-new-creation-of-classic-slack-apps-and-custom-bots

To Reproduce
Try to add a new Slack bot configuration with https://api.slack.com/apps?new_classic_app=1, as stated in the documentation (https://github.com/42wim/matterbridge/wiki/Slack-bot-setup#create-the-classic-slack-app)

Expected behavior
A new bot should be added.