chore(deps): update github actions

[ferrlabs-renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/setup-qemu-action (changelog)	action	digest	96fe6ef → 1f40c72
dtolnay/rust-toolchain (changelog)	action	digest	4360b52 → 6bed076

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[github-actions]

SonarQube — aucune nouvelle issue

_{Comparaison entre le projet bac à sable de cette PR et la branche par défaut : SonarQube Community n'analyse pas les PR, ce delta est calculé côté CI. Détail}

[ferrfleet]

Digest-only pin bumps for dtolnay/rust-toolchain (tag stable unchanged) and docker/setup-qemu-action (tag v4 unchanged) — no version or API change, just the underlying commit each tag points to. No breaking changes to evaluate. All 20 checks green, including the CI jobs that exercise the affected workflows (ci-rust.yml, cli-release.yml, publish.yml). Uneventful, safe to merge.