If the library files under /vendor directory is not updated to the updated jsonnet library, open jsonnetfile.lock.json and delete the version and sum.
{
"source": {
"git": {
"remote": "https://github.com/grafana/loki.git",
"subdir": "production/ksonnet/loki"
}
},
"version": "05bb3cec4c397181eeecc618c3419220757034f2",
"sum": "Cyki99F/2CakeQj6CmNievoUQWDRBnSLF5a768IzUno="
},