[redhat] scripts: sort dumped keys in uki_create_json.py

Patrick Talbertrequested to merge
ptalbert/centos-stream-9:kmaint_1515_c9s into main

JIRA: INTERNAL

The order of the keys in the json output may change causing unnecessary
churn in the dist-git diffs. Fix this by setting sort_keys=True in the
json.dump() call. Outside of locale sorting differences this should
provide a more stable experience.

Signed-off-by: Patrick Talbert <ptalbert@redhat.com>  
(cherry picked from commit 4fcf24df7f4ed4a55c5e51f9f631f1ebb07c86f6)

Signed-off-by: Patrick Talbert ptalbert@redhat.com

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