Update module github.com/google/go-jsonnet to v0.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/google/go-jsonnet	v0.19.1 -> v0.20.0

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Release Notes

google/go-jsonnet (github.com/google/go-jsonnet)

### [`v0.20.0`](https://togithub.com/google/go-jsonnet/releases/tag/v0.20.0) [Compare Source](https://togithub.com/google/go-jsonnet/compare/v0.19.1...v0.20.0) See https://github.com/google/jsonnet/releases/tag/v0.20.0

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Configuration

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