bind: upgrade 9.20.9 -> 9.20.11

bind: upgrade 9.20.9 -> 9.20.11

Overview of changes in bind 9.20.11
==================================
Security Fixes:
1. Fix a possible assertion failure when stale-answer-client-timeout is set to 0.
2. In specific circumstances the named resolver process could exit with an
   assertion failure when stale answers were enabled and the stale-answer-client-timeout
   configuration option was set to 0. This has been fixed. (CVE-2025-40777) [GL #5372]

For additional feature changes and bug fixes, please see:
https://downloads.isc.org/isc/bind9/9.20.11/doc/arm/html/notes.html#notes-for-bind-9-20-11

Signed-off-by: Praveen Kumar <praveen.kumar@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>