Bump zstandard from 0.19.0 to 0.20.0 (#3305)

Bumps [zstandard](https://github.com/indygreg/python-zstandard) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/indygreg/python-zstandard/releases)
- [Changelog](https://github.com/indygreg/python-zstandard/blob/main/docs/news.rst)
- [Commits](https://github.com/indygreg/python-zstandard/compare/0.19.0...0.20.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -30,4 +30,4 @@ taskcluster==47.1.0
 tenacity==8.2.1
 tqdm==4.64.1
 xgboost==1.7.4
-zstandard==0.19.0
+zstandard==0.20.0