[viceice]

Changes

Drops the jactionlint group rule (moved in #4214). CI now installs jactionlint with mise, so the workflows no longer reference the ghcr.io/jdx/jactionlint docker image and there is only the mise tool left to update.

Context

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• This closes an existing Issue, Closes: #
• This doesn't close an Issue, but I accept the risk that this PR may be closed if maintainers disagree with its opening or implementation

AI assistance disclosure

Did you use AI tools to create any part of this pull request?

Please select one option and, if yes, briefly describe how AI was used (e.g., code, tests, docs) and which tool(s) you used.

• No — I did not use AI for this contribution.
• Yes — minimal assistance (e.g., IDE autocomplete, small code completions, grammar fixes).
• Yes — substantive assistance (AI-generated non‑trivial portions of code, tests, or documentation).
• Yes — other (please describe):

Claude Opus 5.5 and Claude Sonnet 5.5 (Claude Code) wrote the change, reviewed by @viceice.

Use of AI in replying to PR comments

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Documentation (please check one with an [x])

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