chore(base-cluster/dependencies): update docker.io/grafana/grafana-image-renderer docker tag to v3.12.9

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/grafana/grafana-image-renderer (source)	patch	3.12.6 -> 3.12.9

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Release Notes

grafana/grafana-image-renderer (docker.io/grafana/grafana-image-renderer)

v3.12.9

Compare Source

• Docker: Update Chromium in Alpine (CVE-2025-6554), #​655, Proximyst

v3.12.8

Compare Source

• Chore: Update base Docker image to latest (CVE-2025-6191, CVE-2025-6192), #​654, Proximyst

v3.12.7

Compare Source

• Chore: Update base Docker image to latest (CVE-2025-5959), #​647, #​648, macabu, Proximyst
• Tracing: Add debug logs when verbose logging is enabled #​644, AgnesToulet

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