Update dependency grafana/grafana-polystat-panel to v1.2.9

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-polystat-panel	ironbank-github	patch	v1.2.8 -> v1.2.9

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Release Notes

grafana/grafana-polystat-panel

v1.2.9

Compare Source

• Now compatible with Grafana v9.0.0

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