Bump scikit-optimize in environment.yml (#403)

Author: basnijholt

docs/environment.yml

@@ -6,7 +6,7 @@ channels:
 dependencies:
   - python
   - sortedcollections=2.1.0
-  - scikit-optimize=0.8.1
+  - scikit-optimize=0.9.0
   - scikit-learn=0.24.2
   - scipy=1.9.1
   - holoviews=1.14.6