chore(deps): update grafana/grafana docker tag to v12.3.0

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/grafana	minor	12.2.0 -> 12.3.0

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Release Notes

grafana/grafana (grafana/grafana)

v12.3.0

Compare Source

v12.2.2

Compare Source

v12.2.1

Compare Source

Features and enhancements

• Go: Update to 1.25.2 + golangci-lint v2.5.0 + golang.org/x/net v0.45.0 #​112156, @​macabu
• Go: Update to 1.25.3 #​112361, @​macabu

Bug fixes

• Auth: Fix render user OAuth passthrough #​112092, @​mgyongyosi
• Dashboards: Fix missing Ctrl+O keyboard shortcut for crosshair toggle #​111402, @​ivanortegaalba
• Fix: Fix redirection after login when Grafana is served from subpath #​111069, @​mgyongyosi
• FlameGraph: Ensure total is only counted once for recursive function calls #​111606, @​simonswine
• LDAP Authentication: Fix URL to propagate username context as parameter #​111849, @​bradleypettit
• Plugins: Dependencies do not inherit parent URL for preinstall #​111769, @​wbrowne
• Table: Backport the Safari 26 fixes to 12.2.1 #​111906, @​fastfrwrd

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