v1.15.2

 ## [1.15.2](https://github.com/go-gitea/gitea/releases/tag/v1.15.2) - 2021-09-03

* BUGFIXES
  * Add unique constraint back into issue_index (#16938)
  * Close storage objects before cleaning (#16934) (#16942)

Signed-off-by: Andrew Thornton <art27@cantab.net>
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