Update cython_nogil buildout branch

component/cython_nogil/buildout.cfg

@@ -12,7 +12,7 @@ recipe = slapos.recipe.build:gitclone
 git-executable = ${git:location}/bin/git
 repository = https://lab.nexedi.com/gsamain/cython.git
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
-branch = nogil_extension_lwan_ccdef
+branch = nogil_extension_lwan_ccdef_refcount
 
 [cython_nogil]
 recipe = plone.recipe.command