Update dependency grafana/grafana-polystat-panel to v2.0.8

This MR contains the following updates:

Package	Type	Update	Change
grafana/grafana-polystat-panel	ironbank-github	patch	v2.0.7 -> v2.0.8

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Release Notes

grafana/grafana-polystat-panel

v2.0.8

Compare Source

• Adds support for additional metric hints depending on the structure of the frames received.

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