Update grafana/grafana-image-renderer Docker tag to v3.12.0

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-image-renderer		minor	3.11.6 -> 3.12.0
grafana/grafana-image-renderer	ironbank-docker	minor	3.11.6 -> 3.12.0
grafana/grafana-image-renderer	stage	minor	3.11.6 -> 3.12.0

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Release Notes

grafana/grafana-image-renderer (grafana/grafana-image-renderer)

v3.12.0

Compare Source

• Support cancel rendering requests on client cancellation #​588, AgnesToulet
• Chore: Add ENV variables for temp folders in Docker #​583, evictorero
• Add image source label to dockerfiles #​573, wuast94

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