gnu: python-pyformlang: Add missing inputs.

* gnu/packages/python-xyz.scm (python-pyformlang) [native-inputs]: Add
python-pytest, python-setuptools, and python-wheel.

Change-Id: I27efca39faf59e83a735dba14029580c7c8b87e2

gnu/packages/python-xyz.scm

@@ -24940,7 +24940,14 @@ cases.")
        (sha256
         (base32 "0szgy4pqfixmswjs37qgma4qa3bsadpp3l1xflrpfi10aa8hh2sp"))))
     (build-system pyproject-build-system)
-    (propagated-inputs (list python-networkx python-numpy python-pydot))
+    (native-inputs
+     (list python-pytest
+           python-setuptools
+           python-wheel))
+    (propagated-inputs
+     (list python-networkx
+           python-numpy
+           python-pydot))
     (home-page "https://github.com/Aunsiels/pyformlang")
     (synopsis "Framework for interacting with formal grammars")
     (description