feat(changelog): add new entry

Author: Changelog bot

changelog/august2025/2025-08-20-cockpit-changed-cockpit-grafana-version-upgraded-to-121.mdx

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+---
+title: Cockpit Grafana version upgraded to 12.1
+status: changed
+date: 2025-08-20
+category: monitoring
+product: cockpit
+---
+
+We have updated your Cockpit's Grafana version from 10.1 to 12.1. Enjoy Grafana's latest release to explore your Scaleway logs and metrics, build dashboards and set up custom alerts.
+