Remove the outdated gem used in Sherlock

We deprecated Sherlock, so we could drop the gem.

Gemfile

@@ -392,8 +392,6 @@ group :development, :test do
 
   gem 'parallel', '~> 1.19', require: false
 
-  gem 'rblineprof', '~> 0.3.6', platform: :mri, require: false
-
   gem 'test_file_finder', '~> 0.1.3'
 end
 

Gemfile.lock

@@ -239,7 +239,6 @@ GEM
       danger
       gitlab (~> 4.2, >= 4.2.0)
     database_cleaner (1.7.0)
-    debugger-ruby_core_source (1.3.8)
     deckar01-task_list (2.3.1)
       html-pipeline
     declarative (0.0.20)
@@ -1009,8 +1008,6 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rblineprof (0.3.6)
-      debugger-ruby_core_source (~> 1.3)
     rbtrace (0.4.14)
       ffi (>= 1.0.6)
       msgpack (>= 0.4.3)
@@ -1594,7 +1591,6 @@ DEPENDENCIES
   rails-controller-testing
   rails-i18n (~> 6.0)
   rainbow (~> 3.0)
-  rblineprof (~> 0.3.6)
   rbtrace (~> 0.4)
   rdoc (~> 6.3.2)
   re2 (~> 1.2.0)