Update dependency grafana/grafana-polystat-panel to v2.1.12

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-polystat-panel	ironbank-github	patch	v2.1.11 -> v2.1.12

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Release Notes

grafana/grafana-polystat-panel (grafana/grafana-polystat-panel)

v2.1.12

Compare Source

• Fix for runtime differences causing parsing errors #​387 and #​389

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