Release notes for Grafana 7.4.2

Explore: Do not show non queryable data sources in data source picker. #31144, @torkelo
Security: Do not allow an anonymous user to create snapshots. CVE-2021-27358. #31263, @marefr

CloudWatch: Ensure empty query row errors are not passed to the panel. #31172, @sunker
DashboardLinks: Fix the links that always cause a full page to reload. #31178, @torkelo
DashboardListPanel: Fix issue with folder picker always showing All and using old form styles. #31160, @torkelo
IPv6: Support host address configured with enclosing square brackets. #31226, @aknuds1
Permissions: Fix team and role permissions on folders/dashboards not displayed for non Grafana Admin users. #31132, @AgnesToulet
Postgres: Fix timeGroup macro converts long intervals to invalid numbers when TimescaleDB is enabled. #31179, @kurokochin
Prometheus: Fix enabling of disabled queries when editing in dashboard. #31055, @ivanahuckova
QueryEditors: Fix an issue that happens after moving queries then editing would update other queries. #31193, @torkelo
SqlDataSources: Fix the Show Generated SQL button in query editors. #31236, @torkelo
StatPanels: Fix an issue where the palette color scheme is not cleared when loading panel. #31126, @torkelo
Variables: Add the default option back for the data source variable. #31208, @hugohaggmark
Variables: Fix missing empty elements from regex filters. #31156, @hugohaggmark