Release 4.4.0

GitLab: update merge request template

Update XCFramework and generator bundle to 4.3.0 staging release

Merge branch 'release-4.1.0-beta.2' into 'main'

Release 4.1.0-beta.2 objectbox-swift#298

See merge request objectbox/objectbox-swift-spm!2

Merge branch '300-get-ready-for-preview' into 'main'

Review and updates for a preview release

See merge request objectbox/objectbox-swift-spm!1