Update dependency google/go-jsonnet to v0.21.0

Author: renovate-bot

modules/satoshi/k8s-tool-versions

@@ -11,7 +11,7 @@ conftest 0.55.0
 
 #asdf:plugin add go-jsonnet https://github.com/sirikon/asdf-go-jsonnet.git
 #renovate: depName=google/go-jsonnet
-go-jsonnet 0.19.1
+go-jsonnet 0.21.0
 
 #asdf:plugin add helm
 helm 3.18.6