Buildroot update

* Updated buildroot
* Removed sd-lldp.patch for the old systemd, replaced with systemd's
  pull request #20333 [1]
* Added updated velia that works with the new systemd patch.
* Updated velia dependencies as we now require nlohmann/json
  (json-for-modern-cpp)
* Updated netconf-cli because we need new code that fixes build against
  boost 1.77 [2]

[1] https://github.com/systemd/systemd/pull/20333
[2] https://gerrit.cesnet.cz/c/CzechLight/netconf-cli/+/5071

Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/netconf-cli/+/5071
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/netconf-cli/+/5071
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/velia/+/4995
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/velia/+/4995
Change-Id: Ifec45c9fbecb3012a769e4c10b37f90382ee4c7d
diff --git a/package/velia/Config.in b/package/velia/Config.in
index f444cc8..4499ba0 100644
--- a/package/velia/Config.in
+++ b/package/velia/Config.in
@@ -8,6 +8,7 @@
 	select BR2_PACKAGE_SYSTEMD
 	select BR2_PACKAGE_SYSREPO
 	select BR2_PACKAGE_SYSREPO_CPP
+	select BR2_PACKAGE_JSON_FOR_MODERN_CPP
 	help
 	  Health tracking for embedded devices running Linux