Update dependency grafana/grafana-polystat-panel to v2.1.9

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-polystat-panel	ironbank-github	patch	v2.1.8 -> v2.1.9

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Release Notes

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

v2.1.9

Compare Source

• NEW: Option to display timestamp of metric inside polygon, available in Global Configuration Section
  • Show Timestamp Toggle on/off
  • Preset time formats, and allows entry of arbitrary format
  • Position of timestamp can be above or below the metric value (default is below)
  • Y Offset can be specified to fine tune placement of timestamp displayed
• Fixed alignment bug when name or value is disabled, will now align correctly (and use more space)

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