chore: bump mergify-cli to 2026.6.18.1

[mergify-ci-bot]

Bumps the mergify-cli Homebrew formula to
2026.6.18.1,
updating RELEASE and the four per-arch sha256 checksums from the
release SHA256SUMS. This PR is automatically generated by the
homebrew-tap-sync
workflow.

[mergify]

Merge Protections

🟢 All 4 merge protections satisfied — ready to merge.

[mergify]

Queued — the merge queue status continues in this comment ↓.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-06-18 12:45 UTC · Rule: automated updates
• ✅ Checks skipped · PR is already up-to-date
• ✅ Merged — 2026-06-18 12:45 UTC · at e1cbbfa5c896782c1adc121fb6ee772951b706f2 · squash

This pull request spent 14 seconds in the queue, including 1 second running CI.

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• all of [🛡 Merge Protections rule Enforce conventional commit]:
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    • chore: bump mergify-cli to 2026.6.18.1 #23
• all of [🛡 Merge Protections rule 📕 PR description]:
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    • chore: bump mergify-cli to 2026.6.18.1 #23
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    • chore: bump mergify-cli to 2026.6.18.1 #23
  • #review-requested = 0
    • chore: bump mergify-cli to 2026.6.18.1 #23
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    • chore: bump mergify-cli to 2026.6.18.1 #23
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