Update dependency grafana/grafana-polystat-panel to v2.1.2

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-polystat-panel	ironbank-github	patch	v2.1.1 -> v2.1.2

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Release Notes

grafana/grafana-polystat-panel

v2.1.2

Compare Source

• Allow display limit of 0 for unlimited polygons #​298

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