chore(sync): update upstream pins for signoz-aio

[aio-fleetbot]

Summary

• Updates upstream pins for signoz-aio.

What changed

• SigNoz: v0.129.0 -> v0.138.0 plus image digest refresh
• Release notes: https://github.com/SigNoz/signoz/releases
• OpenTelemetry Collector Contrib: 0.154.0 -> 0.159.0 plus image digest refresh
• Release notes: https://github.com/open-telemetry/opentelemetry-collector-releases/releases
• Source repo paths reviewed/generated:
  • Dockerfile
  • components/signoz-agent/Dockerfile

Why

• Keeps the AIO wrapper aligned with upstream while preserving human review.
• Source repo changes are validated here first; catalog sync follows the validated source repo and never starts in awesome-unraid.

Validation

• Generated by aio-fleet upstream monitor; central checks should run on this PR.
• The generated commit must be verified/signed before branch protection allows merge.

Safety assessment

• Safety: warn (0.55 confidence)
• Config delta: none
• Template impact: no-xml-change
• Runtime smoke: configured-not-seen
• Next action: runtime/integration tests are configured but no PR runtime check was found
• Review warning: release notes inspection pending on dashboard refresh
• Review warning: runtime/integration tests are configured but no PR runtime check was found
• Dashboard safety state is authoritative after this PR and its checks are visible to aio-fleet.

[matt-lethargic]

@JSONbored can we merge this? I'd like the latest version of signoz that this contains