chore(deps): update ferrlabs/.github digest to 539e9ac

[ferrlabs-renovate]

This PR contains the following updates:

Package	Type	Update	Change
FerrLabs/.github (changelog)	workflow	digest	fba6f4b → 539e9ac

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[ferrfleet]

Digest bump for FerrLabs/.github (fba6f4b → 539e9ac), touching the pins used by pr-title.yml, renovate-rebase.yml, and security-scan.yml.

WHAT CHANGED: one commit in that range (#331), bumping the ferrlabs/ferrflow action version inside reusable-ferrflow-release.yml.

WHAT BREAKS HERE: nothing. This repo doesn't reference reusable-ferrflow-release.yml at all (confirmed via search) — the three reusable workflows this PR actually re-pins (reusable-pr-title.yml, reusable-renovate-dispatch.yml, reusable-security-scan.yml) are untouched by the underlying commit. Pure no-op digest churn for this repo.

CI: all relevant checks green (Lint, Test, PR title, gitleaks, zizmor, snyk, osv-scanner). opengrep was still in progress at review time, unrelated to this change.