[bob-devel] update bob-devel to make sure everything works with strict channel priority

conda/bob-devel/meta.yaml

@@ -4,7 +4,7 @@ package:
   name: bob-devel
   # please update the version of beat-devel and update bob-devel's version
   # there as well in the same merge request.
-  version: 2019.12.20
+  version: 2020.01.09
 
 build:
   # the build number must be zero all the time.