doc: update known issues for NCS v2.9.0

Added v2.9.0 to known issues.

Signed-off-by: divya pillai <[email protected]>

Author: divipillai

doc/nrf/links.txt

@@ -25,6 +25,7 @@
 .. _`Zephyr net DHCPv4 server`: https://docs.zephyrproject.org/apidoc/latest/group__dhcpv4__server.html
 .. _`Zephyr Wi-Fi NM API`: https://docs.zephyrproject.org/apidoc/latest/wifi__nm_8h.html
 .. _`Zephyr Wi-Fi management`: https://docs.zephyrproject.org/latest/connectivity/networking/api/wifi.html
+.. _`Zephyr PR #83028`: https://github.com/zephyrproject-rtos/zephyr/pull/83028
 
 .. ### Source: github.com