chore(deps): bump github.com/slack-go/slack from 0.17.3 to 0.20.0

[dependabot]

Bumps github.com/slack-go/slack from 0.17.3 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

v0.19.0

Added

• Add support for task_card and plan agent blocks by @​nlopes in slack-go/slack#1536
• Add optional HTTP retry for Web API (429, 5xx, connection errors) by @​olegbespalov in slack-go/slack#1532

Full Changelog: slack-go/slack@v0.18.0...v0.19.0

v0.18.0

This is the first stable release in the 0.18.x series — it includes everything from rc1 and rc2 plus a handful of new features and fixes that landed since.

There are a few breaking changes in this one. I tried to keep them to the minimum necessary but some were long overdue. Here's what you need to know.

Breaking changes

File upload API cleanup (#1481)

Slack discontinued the old files.upload API back in November 2025, so we finally removed the deprecated UploadFile, UploadFileContext, and FileUploadParameters. The V2 variants have been renamed to drop the suffix:

• UploadFileV2 → UploadFile
• UploadFileV2Context → UploadFileContext
• UploadFileV2Parameters → UploadFileParameters

Should be a quick search-and-replace for most codebases.

GetReactions return type (#1480)

GetReactions now returns ReactedItem instead of []ItemReaction. This aligns with what the Slack API actually returns — the item itself (message, file, or file_comment) alongside its reactions. To migrate, use resp.Reactions to get at the slice.

... (truncated)

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.

[0.19.0] - 2026-03-04

Added

• Optional HTTP retry for Web API — Retries are off by default. Enable with OptionRetry(n) for 429-only retries or OptionRetryConfig(cfg) for full control including 5xx and connection errors with exponential backoff. (#1532)
• task_card and plan agent blocks — New block types for task cards and plan agent blocks. (#1536)

Changed

• CI: bumped actions/stale from 10.1.1 to 10.2.0. (#1534)
• Use golangci-lint in Makefile. (#1533)

[0.18.0] - 2026-02-21

Added

• focus_on_load support for remaining block elements — Static/external/users/conversations/channels select, multi-select variants, datepicker, timepicker, plain_text_input, checkboxes, radio_buttons, and number_input. (#1519)
• PlainText and PreviewPlainText fields on File — Email file objects now include the plain text body fields instead of silently discarding them. (#1522)
• Missing fields on User, UserProfile, and EnterpriseUser — who_can_share_contact_card, always_active, pronouns, image_1024, is_custom_image, status_text_canonical, huddle_state, huddle_state_expiration_ts, start_date, and is_primary_owner. (#1526)
• Work Objects support — Chat unfurl with Work Object metadata, entity details (flexpane), entity_details_requested event, and associated types (WorkObjectMetadata, WorkObjectEntity, WorkObjectExternalRef). (#1529)
• admin.roles.* API methods — admin.roles.listAssignments, admin.roles.addAssignments, and admin.roles.removeAssignments. (#1520)

Fixed

• UserProfile.Skype JSON tag — Corrected typo from "skyp" to "skype". (#1524)
• assistant.threads.setSuggestedPrompts title parameter — Title is now sent when non-empty. (#1528)

Changed

• CI test matrix updated: dropped Go 1.24, added Go 1.26; bumped golangci-lint to v2.10.1. (#1530)

... (truncated)

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
• eaddf77 chore: v0.19.0
• Additional commits viewable in compare view

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