MT#62935 Update sysctl kernel.core_pattern for systemd 247.3-7+deb11u7 security update

The systemd package got a security update in Debian bullseye, which
changed the systemd-coredump kernel sysctl core_pattern value (by
appending « %d»). This is part of the fix for CVE-2025-4598.

This has caused ngcp-system-tests to fail to match the new pattern,
so we need to adapt it for all currently support Debian bullseye
releases.

Ref: https://security-tracker.debian.org/tracker/CVE-2025-4598
Ref: 2eb46dce07
Change-Id: I531f197e47094321d688d425fb7f577b42fd7391
(cherry picked from commit 2abaac7e3c)
(cherry picked from commit d2c3722364)

templates/610_kernel-sysctl-params.yaml.tt2

@@ -4,7 +4,7 @@ kernel-param:
     value: "1"
 
   kernel.core_pattern:
-    value: "|/lib/systemd/systemd-coredump %P %u %g %s %t 9223372036854775808 %h"
+    value: "|/lib/systemd/systemd-coredump %P %u %g %s %t 9223372036854775808 %h %d"
 
   fs.suid_dumpable:
     value: "2"