bump to 2.4 and gluon 2021.1

update-gluon.sh

@@ -4,8 +4,8 @@ set -x
 set -eu
 set -o pipefail
 
-gluon_major="v2020.2"
-site_branch="v2.3"
+gluon_major="v2021.1"
+site_branch="v2.4"
 
 gluon_fork_git_url="ssh://git@gitlab.freifunk-stuttgart.de:22220/firmware/gluon.git"
 gluon_upstream_git_url="https://github.com/freifunk-gluon/gluon.git"