chore(deps): update grafana/grafana docker tag to v12.4.3

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/grafana	patch	12.4.2 → 12.4.3

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Release Notes

grafana/grafana (grafana/grafana)

v12.4.3

Compare Source

Features and enhancements

• Analytics: Keep internal dashboard id #​121417, @​ryantxu
• Go: Update to 1.25.9 #​122095, @​macabu
• Reporting: Correctly apply appSubURL to report settings requests (Enterprise)

Bug fixes

• Alerting: Document Grafana HA Alertmanager cluster metrics prefix change in Grafana 12.4 #​121481, @​alexander-akhmetov

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