Fix #7339. shortest_path
inconsisitent with warning
#7341
Merged
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The warning says the return type will change from dict to iterator in version 3.5. This PR changes the return type to dict, since we are not yet on version 3.5.
Please see #7339 for details. I think this will make main branch consistent and resolve the inconsistencies introduced in #6584 and #7161.