chore(deps): update ferrlabs/.github digest to b6a08e6

[ferrlabs-renovate]

This PR contains the following updates:

Package	Type	Update	Change
FerrLabs/.github (changelog)	workflow	digest	006179d → b6a08e6

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[ferrfleet]

Digest bump for FerrLabs/.github, three callers repinned to the same new commit (b6a08e6). Only one commit sits between the old and new SHA: "keep a failed artifact upload from failing the gate that produced it" (#368).

What changed upstream: adds continue-on-error: true to several actions/upload-artifact steps (coverage handoffs in reusable-ci-go/node/rust.yml, SBOM upload in reusable-docker-build.yml, trufflehog findings upload in reusable-security-scan.yml) so an artifact-upload failure no longer fails the job that produced the artifact. No removed/renamed inputs, no new required inputs, no changed defaults.

What breaks here: of the three reusable workflows this repo calls (reusable-pr-title.yml, reusable-ferrflow-release.yml, reusable-security-scan.yml), only reusable-security-scan.yml was touched, and only the "Upload findings" (trufflehog) step's failure mode changed — it's now best-effort instead of fatal. That's strictly more lenient, no action needed here. reusable-pr-title.yml and reusable-ferrflow-release.yml weren't modified in this commit.

CI: all checks green except opengrep (SAST) still running at review time, nothing suggests it's related to this bump.

Uneventful, safe to merge.