split up build deps

Author: bollwyvl

.binder/environment.yml

@@ -4,12 +4,13 @@ channels:
   - nodefaults
 dependencies:
   # runtimes
-  - python >=3.6
   - nodejs >=12,!=13,<15  # prefer LTS
   - pip
+  - python >=3.6,<3.10
+  - yarn <2
+  # packaging dependencies
   - wheel
   - setuptools
-  - yarn <2
   # dependencies
   - ipydatawidgets >=1.1.1
   - ipywidgets >=7.2.1