component/pygolang: update test profile for gpython section rename

test software failed to install since 1e9a9019 (pygolang: Accompany
python-interpreter with gpython-interpreter to run gpython instead of
std python, 2024-05-06)

component/pygolang/test.cfg

@@ -9,7 +9,7 @@ extends =
 
 parts =
     pygolang
-    gpython
+    gpython-interpreter
     pygolang-python
 
 #   for instance