build(deps): bump github.com/google/go-jsonnet in /scripts (#1924)

Bumps [github.com/google/go-jsonnet](https://github.com/google/go-jsonnet) from 0.18.0 to 0.19.1.
- [Release notes](https://github.com/google/go-jsonnet/releases)
- [Changelog](https://github.com/google/go-jsonnet/blob/master/.goreleaser.yml)
- [Commits](https://github.com/google/go-jsonnet/compare/v0.18.0...v0.19.1

)

---
updated-dependencies:
- dependency-name: github.com/google/go-jsonnet
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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