[issue22824] Update reprlib to use set literals

[Roundup Robot]

Roundup Robot added the comment:

New changeset cf5b910ac4c8 by Raymond Hettinger in branch 'default':
Issue #22824:  Simplify reprlib output format for empty arrays
https://hg.python.org/cpython/rev/cf5b910ac4c8

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22824>
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