Pin sidekiq-unique-jobs to working version

A [bug in version
8.0.8](mhenrixon/sidekiq-unique-jobs#846)
means jobs never get processed when using `until_and_while_executing`
lock type.

Therefore pinning to use an earlier version that does not have this
issue.

Gemfile

@@ -14,7 +14,7 @@ gem "pg"
 gem "plek"
 gem "sentry-sidekiq"
 gem "sidekiq-scheduler"
-gem "sidekiq-unique-jobs"
+gem "sidekiq-unique-jobs", "< 8.0.8"
 
 group :development, :test do
   gem "brakeman"

Gemfile.lock

@@ -656,7 +656,7 @@ GEM
       rufus-scheduler (~> 3.2)
       sidekiq (>= 6, < 8)
       tilt (>= 1.4.0, < 3)
-    sidekiq-unique-jobs (8.0.10)
+    sidekiq-unique-jobs (8.0.7)
       concurrent-ruby (~> 1.0, >= 1.0.5)
       sidekiq (>= 7.0.0, < 8.0.0)
       thor (>= 1.0, < 3.0)
@@ -741,7 +741,7 @@ DEPENDENCIES
   rubocop-govuk
   sentry-sidekiq
   sidekiq-scheduler
-  sidekiq-unique-jobs
+  sidekiq-unique-jobs (< 8.0.8)
   simplecov
   timecop
   web-console