Bump scikit-learn from 1.5.1 to 1.6.0 in /rastervision_core

Bumps [scikit-learn](https://github.com/scikit-learn/scikit-learn) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/scikit-learn/scikit-learn/releases)
- [Commits](scikit-learn/scikit-learn@1.5.1...1.6.0)

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

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

rastervision_core/requirements.txt

@@ -6,7 +6,7 @@ pillow==10.4.0
 pyproj==3.6.1
 rasterio==1.3.10
 pystac==1.10.1
-scikit-learn==1.5.1
+scikit-learn==1.6.0
 scipy==1.14.0
 opencv-python-headless==4.10.0.84
 tqdm==4.66.5