Remove deprecated ${PYTHON_PN}-importlib from the RDEPENDS

The ${PYTHON_PN}-importlib package was removed as part of the migration to the
json manifest file.  The functionality is now part of core

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-python/recipes-devtools/python/python-dbusmock_0.16.7.bb

@@ -20,7 +20,6 @@ inherit pypi setuptools
 
 RDEPENDS_${PN} += "\
     ${PYTHON_PN}-dbus \
-    ${PYTHON_PN}-importlib \
     ${PYTHON_PN}-pygobject \
     ${PYTHON_PN}-xml \
     "