chore: bump actionlint to 1.7.12 in lint-workflows

[itsyoboieltr]

Description

Bumps actionlint from 1.7.7 to 1.7.12 in the reusable lint-workflows workflow to pick up support for newer GitHub Actions features.

The download-actionlint.bash script ref is unchanged; only the pinned actionlint version it installs is bumped.

Changes

• .github/workflows/lint-workflows.yml: 1.7.7 → 1.7.12
• CHANGELOG.md: add entry under [Unreleased]

Notes

This is a non-breaking change, so it should land in the next minor release (1.12.0). Consumers referencing the reusable workflow via @v1 will pick it up automatically once released.

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Note

Low Risk
CI-only dependency version bump with no application, auth, or data-handling changes.

Overview
Updates the reusable lint-workflows workflow so CI installs actionlint 1.7.12 instead of 1.7.7, and pins the upstream download-actionlint.bash script to a newer commit on the rhysd/actionlint repo. A [Unreleased] changelog entry documents the bump.

Consumers that call this workflow (e.g. main.yml) get stricter or more accurate workflow linting for newer GitHub Actions syntax without changing workflow structure.

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