Bump sidekiq from 5.2.6 to 5.2.7 (publiclab#5580)

Bumps [sidekiq](https://github.com/mperham/sidekiq) from 5.2.6 to 5.2.7.
- [Release notes](https://github.com/mperham/sidekiq/releases)
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](sidekiq/sidekiq@v5.2.6...v5.2.7)

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

Gemfile.lock

@@ -429,7 +429,7 @@ GEM
       rubyzip (~> 1.2, >= 1.2.2)
     sentry-raven (2.9.0)
       faraday (>= 0.7.6, < 1.0)
-    sidekiq (5.2.6)
+    sidekiq (5.2.7)
       connection_pool (~> 2.2, >= 2.2.2)
       rack (>= 1.5.0)
       rack-protection (>= 1.5.0)