Fix name of bullseye-security repo.

install.sh

@@ -6,7 +6,7 @@ set -x
 DATE="20220316T000000Z"
 cat << EOF > /etc/apt/sources.list
 deb http://snapshot.debian.org/archive/debian/${DATE}/ bullseye main
-deb http://snapshot.debian.org/archive/debian-security/${DATE}/ bullseye/updates main
+deb http://snapshot.debian.org/archive/debian-security/${DATE}/ bullseye-security main
 EOF
 
 # ignore expired package releases if env variable is set