[3.20] prepare 3.20~alpha1 release (#12095)

Signed-off-by: Etienne Marais <self@maiste.fr>

Author: maiste

CHANGES.md

@@ -1,4 +1,4 @@
-3.20.0~alpha0 (2025-07-28)
+3.20.0~alpha1 (2025-07-29)
 --------------------------
 
 ### Fixed
@@ -54,6 +54,10 @@
 - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@`
   syntax in the command line (#12043, fixes #5775, @rgrinberg)
 
+- Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test
+  time limits. Tests exceeding the timeout are terminated with an error.
+  (#12041, @Alizter)
+
 ### Changed
 
 - Format long lists in s-expressions to fill the line instead of