update debian release in support matrix

it was omitted in Caracal cycle

Change-Id: I913208b09771bc18ad3214d7518a837d762f6c33
Signed-off-by: Bartosz Bezak <[email protected]>
(cherry picked from commit f25cf12)

Author: bbezak

doc/source/support_matrix.rst

@@ -18,7 +18,7 @@ The following base container images are supported:
 Distribution       Default base                    Default base tag
 ================== =============================== ================
 Rocky Linux        quay.io/rockylinux/rockylinux   9
-Debian Bullseye    debian                          bullseye
+Debian Bookworm    debian                          bookworm
 Ubuntu Jammy       ubuntu                          22.04
 Ubuntu Noble       ubuntu                          24.04
 ================== =============================== ================