v40-rc4

This is a release candidate for v40.

Notable Changes

• Optimize Core.Packet class
• Migrate some widgets to GtkBuilder
• Use native date functions to allow JIT optimization
• Minor a11y improvements
• Shell Extension: Remove tweener usage deprecated in GNOME 3.38 (#905, reported by @voxik)

As always, thanks to contributors of all kinds to GSConnect the KDE Connect team.

List of changes since v39 here.