build(deps): bump cachier from 4.1.0 to 4.2.0 in /requirements

Bumps [cachier](https://github.com/python-cachier/cachier) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/python-cachier/cachier/releases)
- [Commits](python-cachier/cachier@v4.1.0...v4.2.0)

---
updated-dependencies:
- dependency-name: cachier
  dependency-version: 4.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/_tests.txt

@@ -18,4 +18,4 @@ fire >=0.7.0, <0.8.0
 
 cloudpickle >1.3, <=3.1.1
 scikit-learn >1.5.0, <1.8.0
-cachier ==4.1.0
+cachier ==4.2.0