Remove deprecated python3-lang from the RDEPENDS

The python3-lang 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-jsonschema_2.6.0.bb

@@ -5,5 +5,6 @@ RDEPENDS_${PN} += " \
     ${PYTHON_PN}-argparse \
     ${PYTHON_PN}-contextlib \
     ${PYTHON_PN}-functools32 \
+    ${PYTHON_PN}-lang \
     ${PYTHON_PN}-re \
 "