update todo gemfile to remove sidekiq too

This wasn't fixed in previous commit, as productivity/todo wasn't updated in the root Makefile/Contexts.
The plan is to move all domains (ecommerce and productivity into one flat domains/ directory), thus simplifying such changes/conventions.

productivity/todo/Gemfile.lock

@@ -9,7 +9,6 @@ PATH
       rake
       ruby_event_store (~> 2.13)
       ruby_event_store-transformations
-      sidekiq
 
 GEM
   remote: https://oss:[email protected]/
@@ -78,22 +77,14 @@ GEM
       ast (~> 2.4.1)
       racc
     racc (1.7.3)
-    rack (3.0.8)
     rake (13.1.0)
-    redis-client (0.19.0)
-      connection_pool
     regexp_parser (2.8.3)
     ruby2_keywords (0.0.5)
     ruby_event_store (2.13.0)
       concurrent-ruby (~> 1.0, >= 1.1.6)
     ruby_event_store-transformations (0.1.0)
       activesupport (>= 5.0)
       ruby_event_store (>= 2.0.0, < 3.0.0)
-    sidekiq (7.2.0)
-      concurrent-ruby (< 2)
-      connection_pool (>= 2.3.0)
-      rack (>= 2.2.4)
-      redis-client (>= 0.14.0)
     sorbet-runtime (0.5.11190)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)