dates per la Debian 13 Trixie i nom per la Debian 15

[Àlex]

2025-03-15 - Milestone 1 - Transition and toolchain freeze
2025-04-15 - Milestone 2 - Soft Freeze
2025-05-15 - Milestone 3 - Hard Freeze - for key packages and packages 
without autopkgtests
To be announced - Milestone 4 - Full Freeze

Debian 15
=========

The release team has decided that the release after trixie and forky 
will be called duke.