[MNT] [Dependabot](deps): Update scikit-learn requirement

Updates the requirements on [scikit-learn](https://github.com/scikit-learn/scikit-learn) to permit the latest version.
- [Release notes](https://github.com/scikit-learn/scikit-learn/releases)
- [Commits](scikit-learn/scikit-learn@0.24.0...1.6.0)

---
updated-dependencies:
- dependency-name: scikit-learn
  dependency-type: direct:production
...

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

pyproject.toml

@@ -43,7 +43,7 @@ dependencies = [
     "pandas>=1.1.0,<2.3.0",
     "packaging",
     "scikit-base>=0.6.1,<0.13.0",
-    "scikit-learn>=0.24.0,<1.6.0",
+    "scikit-learn>=0.24.0,<1.7.0",
     "scipy<2.0.0,>=1.2.0",
 ]