8.2
deprecate the TransportFactoryTestCase
Add PR template and auto-close PR on subtree split repositories
[Notifier] Add MessageBird notifier bridge
[Notifier] Add SMS options to MessageBird notifier
Update license years (last time)
Use CPP where possible
CS fixes
Narrow existing return types on private/internal/final/test methods
Add call to backers in README files
Bump to php >= 8.4.1
Update XSD references in phpunit.xml.dist files