Rotate all API keys after Heroku security breach

[maxwofford]

Part of https://github.com/hackclub/hackclub/issues/1767

These tokens need to be rotated:

• [ ] AIRTABLE_KEY
• [ ] BUGSNAG_API_KEY
• [ ] CLIPPY_KEY
• [ ] GITHUB_ACCESS_TOKEN
• [ ] REDISCLOUD_URL
• [ ] SLACK_BOT_TOKEN
• [ ] SLACK_CLIENT_ID
• [ ] SLACK_CLIENT_SECRET
• [ ] SLACK_CLIENT_SIGNING_SECRET
• [ ] SLACK_INVITE_TOKEN
• [ ] SLACK_LEGACY_TOKEN
• [ ] PRIVACY_API_KEY
• [ ] SANDBOX_PRIVACY_API_KEY
• [ ] GITHUB_ACCESS_TOKEN
• [ ] ZOOM_KEY
• [ ] ZOOM_SECRET