Bump sidekiq in /contrib/ruby_event_store-sidekiq_scheduler

Bumps [sidekiq](https://github.com/sidekiq/sidekiq) from 7.0.7 to 7.0.8.
- [Release notes](https://github.com/sidekiq/sidekiq/releases)
- [Changelog](https://github.com/sidekiq/sidekiq/blob/main/Changes.md)
- [Commits](sidekiq/sidekiq@v7.0.7...v7.0.8)

---
updated-dependencies:
- dependency-name: sidekiq
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

contrib/ruby_event_store-sidekiq_scheduler/Gemfile.lock

@@ -205,7 +205,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
-    sidekiq (7.0.7)
+    sidekiq (7.0.8)
       concurrent-ruby (< 2)
       connection_pool (>= 2.3.0)
       rack (>= 2.2.4)