Bump numpyro from 0.19.0 to 0.20.0 (#670)

Bumps [numpyro](https://github.com/pyro-ppl/numpyro) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/pyro-ppl/numpyro/releases)
- [Commits](pyro-ppl/numpyro@0.19.0...0.20.0)

---
updated-dependencies:
- dependency-name: numpyro
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]