build(deps): bump scikit-learn from 1.5.0 to 1.6.1 in /pmml

Bumps [scikit-learn](https://github.com/scikit-learn/scikit-learn) from 1.5.0 to 1.6.1.
- [Release notes](https://github.com/scikit-learn/scikit-learn/releases)
- [Commits](scikit-learn/scikit-learn@1.5.0...1.6.1)

---
updated-dependencies:
- dependency-name: scikit-learn
  dependency-version: 1.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pmml/requirements.txt

@@ -2,6 +2,6 @@ matplotlib==3.9.4
 numpy==2.0.2
 pandas==2.3.2
 pypmml==1.5.7
-scikit-learn==1.5.0
+scikit-learn==1.6.1
 sklearn2pmml==0.121.1
 seaborn==0.13.2