fix(py-pynn): Dependency on py-setuptools@61:

We encountered package installs (using some py-setuptools@59… that failed with an UNKNOWN package name.

⇒ setuptools meta data is only supported since py-setuptools 61 or later, see: https://setuptools.pypa.io/en/latest/history.html#v61-0-0

@jkaiser I created a CS from your debug result → please check (marked as draft here) ;).

packages/py-pynn/package.py

@@ -32,6 +32,7 @@ class PyPynn(PythonPackage):
     depends_on('python@3.8:',         when="@0.11.0:")
 
     depends_on('py-setuptools',         type=('build'))
+    depends_on('py-setuptools@61:',     type=('build'), when="@0.11:")
 
     depends_on('py-jinja2@2.7:',        type=('run', 'test'))
     depends_on('py-docutils@0.10:',     type=('run', 'test'))