Fixes rubocop violation in repo storage spec

Addresses a rubocop symbol conversion violation in the repository
storage partial spec file

.rubocop_todo/lint/symbol_conversion.yml

@@ -140,5 +140,4 @@ Lint/SymbolConversion:
     - 'spec/support/shared_examples/harbor/repositories_controller_shared_examples.rb'
     - 'spec/support/shared_examples/harbor/tags_controller_shared_examples.rb'
     - 'spec/support/shared_examples/models/diff_positionable_note_shared_examples.rb'
-    - 'spec/views/admin/application_settings/_repository_storage.html.haml_spec.rb'
     - 'spec/workers/gitlab/github_gists_import/import_gist_worker_spec.rb'

spec/views/admin/application_settings/_repository_storage.html.haml_spec.rb

@@ -6,7 +6,7 @@
   let(:app_settings) { build(:application_setting, repository_storages_weighted: repository_storages_weighted) }
 
   before do
-    stub_storage_settings({ 'default': {}, 'mepmep': {}, 'foobar': {} })
+    stub_storage_settings({ default: {}, mepmep: {}, foobar: {} })
     assign(:application_setting, app_settings)
   end