grafana: update to 8.3.1 (Only compile tested, sorry.)

Security: Fixes CVE-2021-43798 directory traversal vulnerability.

Features and enhancements 8.3
  Alerting: Prevent folders from being deleted when they contain alerts.
  Alerting: Show full preview value in tooltip.
  BarGauge: Limit title width when name is really long.
  CloudMonitoring: Avoid to escape regexps in filters.
  CloudWatch: Add support for AWS Metric Insights.
  TooltipPlugin: Remove other panels' shared tooltip in edit panel.
  Visualizations: Limit y label width to 40% of visualization width.

Features and enhancements 8.2
  AWS: Updated AWS authentication documentation.
  Alerting: Added support Alertmanager data source for upstream Prometheus AM implementation.
  Alerting: Allows more characters in label names so notifications are sent.
  Alerting: Get alert rules for a dashboard or a panel using /api/v1/rules endpoints.
  Annotations: Improved rendering performance of event markers.
  CloudWatch Logs: Skip caching for log queries.
  Explore: Added an opt-in configuration for Node Graph in Jaeger, Zipkin, and Tempo.
  Packaging: Add stricter systemd unit options.
  Prometheus: Metrics browser can now handle label values with special characters.

(tnn)