add missing dependency on setuptools

packages/py-hbp-validation-client/package.py

@@ -23,6 +23,7 @@ class PyHbpValidationClient(PythonPackage):
     version("0.6.3", sha256="e9d27a5d1bbc7066877d6a97eb1bcb90c70b5ec00d9027425d85f796c6a9e8c4")
 
     depends_on('python@3.6.9:')
+    depends_on('py-setuptools',            type=('build'))
     depends_on('py-requests@2.26.0:',      type=('build', 'run'))
     depends_on('py-nameparser@1.1.1:',     type=('build', 'run'))
     depends_on('py-ebrains-drive@0.4.0:',  type=('build', 'run'))