DAOS-18129 build: update the ubuntu changelog and release notes (#17073)

Signed-off-by: Mohamad Chaarawi <mohamad.chaarawi@hpe.com>

Author: mchaarawi

debian/changelog

@@ -1,3 +1,9 @@
+daos (2.6.4-7) unstable; urgency=medium
+  [ Mohamad Chaarawi ]
+  * Fix libfabric packaging
+
+ -- Mohamad Chaarawi <mohamad.chaarawi@hpe.com>  Fri, 31 Oct 2025 20:00:00 -0500
+
 daos (2.6.4-6) unstable; urgency=medium
   [ Phillip Henderson ]
   * Fourth release candidate for 2.6.4

docs/release/release_notes.md

@@ -4,10 +4,10 @@ We are pleased to announce the release of DAOS version 2.6.
 
 ## DAOS Version 2.6.4 (2025-10-29)
 
-The DAOS 2.6.4 release includes the daos-2.6.4-6 RPM packages and their prerequisites.
+The DAOS 2.6.4 release includes the daos-2.6.4-7 RPM packages and their prerequisites.
 It contains the following updates on top of DAOS 2.6.3:
 
-* Libfabric has been updated to version 1.22.0-4.
+* Libfabric has been updated to version 1.20.0.
 * Mercury has been upgraded to version 2.4.0-7.
 * Argobots has been upgraded to version 1.2-3.
 * Libisal has been upgraded to version 2.31.1-7.