Bump sidekiq-unique-jobs from 6.0.12 to 6.0.13 (mastodon#10580)

Bumps [sidekiq-unique-jobs](https://github.com/mhenrixon/sidekiq-unique-jobs) from 6.0.12 to 6.0.13.
- [Release notes](https://github.com/mhenrixon/sidekiq-unique-jobs/releases)
- [Changelog](https://github.com/mhenrixon/sidekiq-unique-jobs/blob/master/CHANGELOG.md)
- [Commits](mhenrixon/sidekiq-unique-jobs@v6.0.12...v6.0.13)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -566,7 +566,7 @@ GEM
       rufus-scheduler (~> 3.2)
       sidekiq (>= 3)
       tilt (>= 1.4.0)
-    sidekiq-unique-jobs (6.0.12)
+    sidekiq-unique-jobs (6.0.13)
       concurrent-ruby (~> 1.0, >= 1.0.5)
       sidekiq (>= 4.0, < 7.0)
       thor (~> 0)