chore(deps): bump github.com/slack-go/slack from 0.19.0 to 0.20.0

[dependabot]

Bumps github.com/slack-go/slack from 0.19.0 to 0.20.0.

Release notes

Sourced from github.com/slack-go/slack's releases.

v0.20.0

[!WARNING] trigger_id and workflow_id are NOT in any documentation or in any of the official libraries, so exercise caution if you use these.

Added

• workflow_id and trigger_id in Message — It seems that some types of messages, e.g: bot_message, can carry trigger_id and workflow_id. WorkflowID was added by @​clayallsopp in slack-go/slack#1537
• RichTextQuote.Border field — optional border toggle (matches the docs now)
• RichTextPreformatted.Language field — enables syntax highlighting for preformatted blocks

Fixed

• Remove embedding of RichTextSection — RichTextQuote and RichTextPreformatted are now flattened as they should have always been. This is a breaking change for anyone using these structs directly.

New Contributors

• @​clayallsopp made their first contribution in slack-go/slack#1537

Full Changelog: slack-go/slack@v0.19.0...v0.20.0

Changelog

Sourced from github.com/slack-go/slack's changelog.

[0.20.0] - 2026-03-21

[!WARNING] trigger_id and workflow_id are NOT in any documentation or in any of the official libraries, so exercise caution if you use these.

Added

• workflow_id and trigger_id in Message — It seems that some types of messages, e.g: bot_message, can carry trigger_id and workflow_id.
• RichTextQuote.Border field — optional border toggle (matches the docs now)
• RichTextPreformatted.Language field — enables syntax highlighting for preformatted blocks

Fixed

• Remove embedding of RichTextSection — RichTextQuote and RichTextPreformatted are now flattened as they should have always been. This is a breaking change for anyone using these structs directly.

Commits

• 449e341 chore: v0.20.0
• 442f330 chore: update CHANGELOG
• 0b4eb25 feat!: flatten RichTextPreformatted to remove RichTextSection embedding
• 46d7b49 feat!: add Border to RichTextQuote and Language to RichTextPreformatted
• c93b916 Revise warning for trigger_id and workflow_id
• 561f12f feat: add TriggerID to Message
• 8e62a1a Add WorkflowID to message (#1537)
• 891d7e5 chore: add golangci-lint to mise
• 8917d11 docs: update README with links and remove old warning
• See full diff in compare view

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