Bump chex from 0.1.87 to 0.1.89

Bumps [chex](https://github.com/deepmind/chex) from 0.1.87 to 0.1.89.
- [Release notes](https://github.com/deepmind/chex/releases)
- [Commits](google-deepmind/chex@v0.1.87...v0.1.89)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@ pandas~=2.2
 jax==0.4.30
 jaxlib==0.4.30
 jaxtyping==0.2.36
-chex==0.1.87
+chex==0.1.89
 optax==0.2.4
 tqdm~=4.67
 matplotlib~=3.9