5.4.0-beta1

What's Changed

• FIX: put current page at top of ClassName dropdown (was broken) by @sunnysideup in #3004
• ENH Don't use deprecated method by @GuySartorelli in #3006
• DEP Increase minimum version of silverstripe/framework by @emteknetnz in #3008
• API Deprecations for template layer by @GuySartorelli in #3012
• API Deprecate API that will be renamed by @GuySartorelli in #3021
• API Deprecate and update code in preparation for CMS 6 by @GuySartorelli in #3023
• API Deprecate campaign admin integrations by @emteknetnz in #3028
• API Deprecate InternalLinkModalExtension by @GuySartorelli in #3030
• Bump cross-spawn from 7.0.3 to 7.0.6 by @dependabot in #3026
• API Deprecate API that's being removed in CMS 6 by @GuySartorelli in #3036
• MNT Update behat test for sudo mode by @emteknetnz in #3056

Full Changelog: 5.3.2...5.4.0-beta1