Update act10ns/slack action to v2.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
act10ns/slack	action	minor	v2.1.0 → v2.2.0

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Release Notes

act10ns/slack (act10ns/slack)

v2.2.0

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What's New

Features

• Multiple channels — channel input now accepts multiple channels separated by spaces or commas
• Blocks-only mode — new blocks_only config option to send only blocks without the legacy attachment
• Workflow-level status — documented pattern for reporting multi-job workflow status
• Template variables reference — full table of all supported Handlebars template variables in README

Bug Fixes

• Filter unnamed steps — steps without an explicit id (auto-generated hex hashes) are now filtered out (#​131)
• Retry on failure — webhook send retries up to 3 times with linear backoff on transient errors (#​196)
• Sanitize template data — user-controlled data (commit messages, PR titles) containing Handlebars syntax no longer causes runtime errors (#​259)
• Warn on missing config — emits a warning when a custom config file path is specified but not found (#​267)
• Stale dist — jobInputs and all recent features now included in bundled dist (#​278)

Infrastructure

• Node.js 24 runtime (previously Node.js 20) (#​284)
• Auto-rebuild dist — CI workflow automatically rebuilds dist/ on merge to master
• Security dependency updates — cross-spawn, minimatch, flatted, picomatch, handlebars, axios, js-yaml

Documentation

• Added CLAUDE.md for contributor guidance
• Updated README with corrected examples, current GitHub docs URLs, and copyright year

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