Plans for v9 release

[mkszepp]

• Drop support for ember < 4.12 (Drop support for ember < 4.12 #1026)
• Drop support for old dependencies/peerDependencies (Drop support for old dependencies/peerDependencies #1027)
• Drop support for passing components as string (Drop support for passing components as string & remove @embroider/util dependency #1025)
• Remove @embroider/util (deprecated and not anymore needed after dropping components a string support) (Drop support for passing components as string & remove @embroider/util dependency #1025)
• Remove blueprints (Remove setup blueprints #1028)
• Remove dropdown option from calculatePosition (Remove dropdown option from calculatePosition #1031)
• Add @triggerHtmlTag on <BasicDropdown> and remove @htmlTag option from yielded trigger component (fix glint v2 issue) (Add @triggerHtmlTag and add workaround to resolve a typing issue when @htmlTag="button" is passed #1033 & Add @triggerHtmlTag on <BasicDropdown> and remove @htmlTag option from yielded trigger component (fix glint v2 issue) #1032)
• Add @contentHtmlTag on <BasicDropdown> and remove @htmlTag option from yielded content component (fix glint v2 issue) (Add @contentHtmlTag #1038 & Improve @contentHtmlTag typing, add tests and update docs #1039)
• Move to glint v2 & improve typescript story for @triggerHtmlTag (Move to glint v2 & improve typescript story for @triggerHtmlTag #1030)
• Remove parameter @dir (Remove parameter @dir on content component #1036)
• Drop support for node-sass (Convert scss files to modern api, update docs & drop node-sass support #1037)
• Fix scss deprecations / move to modern api (Convert scss files to modern api, update docs & drop node-sass support #1037)
• Migrate to new addon v2 blueprint https://github.com/ember-cli/ember-addon-blueprint (Convert to new v2 addon blueprint #1041)
• Improve typing by hiding auto-passed properties in yielded components (Improve typing by hiding auto-passed properties in yielded components #1043)
• Remove deprecated code (Remove deprecations #1044)
• Implement @verticalPosition="auto" for @renderInPlace={{true}} (Implement @verticalPosition="auto" for @renderInPlace={{true}} #1045)
• Add css variables support (Add css variables support #1053)

Target date: tba