chore(deps): update grafana/grafana docker tag to v12.4.2

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/grafana	patch	12.4.1-ubuntu → 12.4.2-ubuntu

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Release Notes

grafana/grafana (grafana/grafana)

v12.4.2

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Features and enhancements

• Analytics tab: Improve voice over accessibility (Enterprise)
• Dashboards a11y: Do not open time zonemenu on focus #​120388, @​idastambuk
• Dashboards: Resolve display names by identity in version history #​120273, @​ivanortegaalba
• Plugins: Forward AWS SDK credential chain env vars to external AWS plugins #​120209, @​kevinwcyu
• Public Dashboards: Prevent unintended CRUD operations from different orgs #​120457, @​mmandrus

Bug fixes

• IAM: Handle NULL team_member.external column to fix dashboard loading #​120179, @​difro
• Plugins: Fix installer IsDisabled condition #​120568, @​andresmgot
• Plugins: Forward PLUGIN_UNIX_SOCKET_DIR to plugin processes to fix tmp dir in restricted environments #​120275, @​HarshadaGawas05
• Security: Fix CVE-2026-27876
• Security: Fix CVE-2026-27877
• Security: Fix CVE-2026-28375
• Security: Fix CVE-2026-27879
• Security: Fix CVE-2026-27880
• Security: Fix CVE-2026-27876
• Security: Fix CVE-2026-27876
• Security: Fix CVE-2026-33375

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