Remove active_record_sane_schema_dumper gem

We don't need this since this is already the default
behavior of Rails since 5.1

Gemfile

@@ -375,8 +375,6 @@ group :development, :test do
   gem 'license_finder', '~> 5.4', require: false
   gem 'knapsack', '~> 1.17'
-  gem 'activerecord_sane_schema_dumper', '1.0'
-
   gem 'stackprof', '~> 0.2.10', require: false
   gem 'simple_po_parser', '~> 1.1.2', require: false

Gemfile.lock

@@ -41,8 +41,6 @@ GEM
     activerecord-explain-analyze (0.1.0)
       activerecord (>= 4)
       pg
-    activerecord_sane_schema_dumper (1.0)
-      rails (>= 5, < 6)
     activestorage (5.2.3)
       actionpack (= 5.2.3)
       activerecord (= 5.2.3)
@@ -1028,7 +1026,6 @@ DEPENDENCIES
   ace-rails-ap (~> 4.1.0)
   acme-client (~> 2.0.2)
   activerecord-explain-analyze (~> 0.1)
-  activerecord_sane_schema_dumper (= 1.0)
   acts-as-taggable-on (~> 6.0)
   addressable (~> 2.5.2)
   akismet (~> 2.0)