Upgrade slack-morphism to 2.19

[chandima]

Fixes #515.

Slack messages were failing to send intermittently — 132 failures in one day, all sizes. Bot token verified working via curl, so the issue was in the HTTP client layer.

Bumping slack-morphism from 2.17 to 2.19 resolves it. The upgrade pulls in tokio-tungstenite 0.29 and signal-hook 0.4, which likely fix the stale connection / WebSocket reset issues we were seeing.

Tested with multiple messages including a full worker pipeline (arxiv paper review → browser tools → 3.5KB result delivered via retrigger). Zero send failures, zero retries needed.

[coderabbitai]

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