Bump xgboost-cpu from 2.1.1 to 2.1.2 (#64)

Bumps [xgboost-cpu](https://github.com/dmlc/xgboost) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/dmlc/xgboost/releases)
- [Changelog](https://github.com/dmlc/xgboost/blob/master/NEWS.md)
- [Commits](dmlc/xgboost@v2.1.1...v2.1.2)

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

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requirements.txt

@@ -1,6 +1,6 @@
 numpy==2.1.2
 pandas==2.2.3
-xgboost-cpu==2.1.1; platform_machine == "x86_64"
+xgboost-cpu==2.1.2; platform_machine == "x86_64"
 xgboost==2.1.2; platform_machine != "x86_64"
 psutil==6.1.0
 pyarrow==17.0.0