[build] Update debootstrap version from deb11u1 to deb11u2 (#18185) (#…

…18236)

Why I did it
deb11u1 is deprecated.
Use deb11u2 instead.
Other branches are not impacted, because their reproducible build version files are up to date.

Work item tracking
Microsoft ADO (number only): 26964185
How I did it
How to verify it

Co-authored-by: Liu Shilong <shilongliu@microsoft.com>

rules/debootstrap.mk

@@ -1,6 +1,6 @@
 # debootstrap package
 
-DEBOOTSTRAP_VERSION = 1.0.123+deb11u1
+DEBOOTSTRAP_VERSION = 1.0.123+deb11u2
 
 export DEBOOTSTRAP_VERSION