stack/slapos.cfg: Change pkgutil-resolve-name version to whl

pkgutil-resolve-name=1.3.10 requires flit_core as build backend.

This is used by component/slapos.

stack/slapos.cfg

@@ -266,7 +266,7 @@ pexpect = 4.8.0
 pickleshare = 0.7.4
 pim-dm = 1.4.0nxd002
 pkgconfig = 1.5.1:whl
-pkgutil-resolve-name = 1.3.10
+pkgutil-resolve-name = 1.3.10:whl
 plone.recipe.command = 1.1
 pluggy = 0.13.1:whl
 ply = 3.11