Resolve "FIx build issue for the new conda-build version"

Closes #5

conda.recipe/meta.yaml

 package:
   name: refscrub
-  version: 2023.2.0.0
+  version: 2023.2.0.1
 
 source:
   path: ../
@@ -13,6 +13,7 @@ requirements:
   build:
     - python >=3.9
     - pip
+    - setuptools
   run:
     - python >=3.9