6.4.0-alpha1

• [NodeBundle] Fix php8 deprecation in ExternalUrlValidator #3361 (@acrobat)
• [AllBundles] Various phpdoc return type fixes #3360 (@acrobat)
• [AllBundles] Fix return type deprecations and add missing return types #3357 (@acrobat)
• [AllBundles] Fix gedmo sibblings deprecation #3356 (@acrobat)
• [AllBundles] Fix issues with adminlist configurator deprecations #3354 (@acrobat)
• [AdminList] Fix AdminLists #3352 (@dannyvw)
• [FormBundle] Remove empty_data from ChoiceFormSubmissionType #3349 (@dannyvw)
• [AdminListBundle] Deprecate configurator getBundleName/getEntityName methods #3347 (@acrobat)
• [AdminBundle] Add extra blocks to authentication layout #3342 (@dannyvw)
• [MediaBundle] - allow custom view vars in chooser #3337 (@delboy1978uk)
• [NodeBundle] View parent nodes from list #3334 (@dannyvw)
• [AdminBundle] Add hide sidebar configuration #3333 (@dannyvw)
• [SearchBundle, NodeSearchBundle] : change nGram to ngram #3331 (@delboy1978uk)
• [DashboardBundle] Fix controller route attribute resolver in DashboardWidget #3325 (@acrobat)
• [AllBundles] Switch Route and Validator annotations to attributes #3323 (@acrobat)
• [FormBundle] Fix draft version form page #3304 (@dannyvw)
• [RedirectBundle] Add order by to redirect admin list #3300 (@dannyvw)
• [PagePartBundle] Allow deleting nested sub-entities #3292 (@acrobat)
• [AllBundle] Add compatibility for new PUBLIC_ACCESS role #3120 (@acrobat)