channels: drop v2025pre

v2025pre was released a month ago, so according to
our policy it's time to drop it completely, see:
https://www.apertis.org/guides/maintenance/apertis_release_process/#dashboard-update



Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

data/channels.yaml

@@ -40,12 +40,6 @@ channels:
   apertis/v2024-updates:
     <<: *apertis_v2024
     suite: v2024-updates
-  apertis/v2025pre:
-    <<: *apertis_v2024
-    release: v2025pre
-    suite: v2025pre
-    base: apertis/v2025pre
-    status: closed
   apertis/v2025:
     <<: &apertis_v2025
       <<: *apertis_v2024