chore(deps): update dependency google/go-jsonnet to v0.21.0

Author: renovate[bot]

.github/workflows/build.yml

@@ -17,7 +17,7 @@ env:
   # renovate: datasource=github-releases depName=jsonnet-bundler/jsonnet-bundler
   JB_VERSION: v0.6.0
   # renovate: datasource=github-releases depName=google/go-jsonnet
-  JSONNET_VERSION: v0.20.0
+  JSONNET_VERSION: v0.21.0
 
 jobs:
   build: