Bump slack-sdk from 3.39.0 to 3.40.0

[dependabot]

Bumps slack-sdk from 3.39.0 to 3.40.0.

Release notes

Sourced from slack-sdk's releases.

v3.40.0

Agent Thinking Steps: Display Tasks/Tools, Plans, and Markdown Text

🍿 Preview: Display as Plan

2026-02-10-thinking-steps-display-mode-plan.mov

🍿 Preview: Display as Timeline

2026-02-10-thinking-steps-display-mode-timeline.mov

📺 Chat Stream with 2 Display Mode

• Plan Display Mode
• Timeline Display Mode

👾 Chat Stream Structured Content

Now, you can display a mixture of structured content called "chunks":

• 🔠 Markdown Text Block to format your text with standard markdown
• ☑️ Task Card Block to display a single task, representing an AI Tool Call or general action
• 🗒️ Plan Block to display a collection of related tasks
• 📚 URL Sources Element to display references within a task card block

Available in:

• 🔌 API Methods: chat_startStream, chat_appendStream, and chat_stopStream
• 🛟 Chat Stream Helper: streamer = client.chat_stream(...), streamer.append(...)

🕹️ Example

streamer = client.chat_stream(
    channel=channel_id,
    recipient_team_id=team_id,
    recipient_user_id=user_id,
    thread_ts=thread_ts,
    task_display_mode="plan",
)
streamer.append(
chunks=[
MarkdownTextChunk(
text="Hello.\nI have received the task. ",
),
MarkdownTextChunk(
text="This task appears manageable.\nThat is good.",
),
TaskUpdateChunk(
</tr></table>

... (truncated)

Commits

• 8b0bd0b chore(release): version 3.40.0 (#1831)
• af6a7bb feat: add thinking steps support as chunks to chat stream with plan and task ...
• c697f35 chore(deps): bump actions/checkout from 6.0.1 to 6.0.2 (#1829)
• 564f131 chore(deps): bump actions/setup-python from 6.1.0 to 6.2.0 (#1828)
• 6752322 chore(deps): update mypy requirement from <=1.19.0 to <=1.19.1 (#1827)
• 4981f34 ci(deps): auto-approve / auto-merge dependencies from dependabot (#1830)
• 95e80f8 chore(deps): bump black from 23.3.0 to 24.3.0 in /requirements (#1786)
• 6a33604 chore(deps): bump actions/upload-artifact from 5.0.0 to 6.0.0 (#1814)
• 8026611 chore(deps): bump actions/download-artifact from 6.0.0 to 7.0.0 (#1813)
• 4e575b7 chore(deps): bump codecov/codecov-action from 5.5.1 to 5.5.2 (#1815)
• Additional commits viewable in compare view

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