Update grafana/grafana Docker tag to v12.3.1

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/grafana	patch	12.3.0 -> 12.3.1

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Release Notes

grafana/grafana (grafana/grafana)

v12.3.1

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Features and enhancements

• Alerting: Update alerting dependency #​114259, @​moustafab
• Azure: Improved column handling in logs query builder #​114841, @​aangelisc
• Azure: Include aggregate columns in logs builder #​114835, @​aangelisc
• Dependencies: Bump Go to v1.25.5 #​114751, @​macabu
• Docs: Clarify section title for repeating rows and tabs #​115346, @​imatwawana
• Plugins: Add PluginContext to plugins when scenes is disabled #​115064, @​hugohaggmark
• QueryEditorRows: Clear hideSeriesFrom override on query edit #​114628, @​Sergej-Vlasov

Bug fixes

• Azure: Fix dcount aggregation #​114907, @​aangelisc
• Azure: Fix percentile syntax #​114707, @​aangelisc
• Dashboards: Fix empty space under time controls when a dashboard has a lot of variables #​114730, @​oscarkilhed
• Plugins: Datasource breadcrumb link should link to settings tab #​113910, @​wbrowne
• Postgresql: Fix variable interpolation logic when the variable has multiple values #​114876, @​itsmylife

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