python: fix build after change in Spec.dependencies signature (#29480)

fixes #29478

As was written Python was looking for dependencies named "link"
rather than dependencies of type "link".

var/spack/repos/builtin/packages/python/package.py

@@ -443,7 +443,7 @@ def configure_args(self):
 
         # setup.py needs to be able to read the CPPFLAGS and LDFLAGS
         # as it scans for the library and headers to build
-        link_deps = spec.dependencies('link')
+        link_deps = spec.dependencies(deptype='link')
 
         if link_deps:
             # Header files are often included assuming they reside in a