Bump chex from 0.1.7 to 0.1.83 in /requirements

Bumps [chex](https://github.com/deepmind/chex) from 0.1.7 to 0.1.83.
- [Release notes](https://github.com/deepmind/chex/releases)
- [Commits](google-deepmind/chex@v0.1.7...v0.1.83)

---
updated-dependencies:
- dependency-name: chex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/test.txt

@@ -1,4 +1,4 @@
-chex==0.1.7
+chex==0.1.83
 pytest==7.4.0
 pytest-cov==4.1.0
 pytest-xdist==3.3.1