Bump actionlint default version to 1.7.12

[hryamzik]

Summary

• Bump the default actionlint binary from 1.7.7 → 1.7.12.
• 1.7.12 supports GitHub Actions on.schedule timezone: (IANA), which older actionlint rejects with element of "schedule" section must be mapping and must contain one key "cron".

Why

smartly-ansible PR https://github.com/smartlyio/smartly-ansible/pull/18240 uses:

schedule:
  - cron: "0 10 * * 5"
    timezone: Europe/Helsinki

Validate/actionlint currently fails on that workflow because @actionlint-v1 still defaults to 1.7.7.

Test plan

• After merge + retag of actionlint-v1, re-run Validate on smartly-ansible#18240 and confirm actionlint accepts timezone.
• Optional: run actionlint 1.7.12 locally against cron-callout-schedule-notifications.yml.

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