Fix some unrelated rubocop offenses

Revealed via `REVEAL_RUBOCOP_TODO`.

spec/lib/gitlab/database/bulk_update_spec.rb

@@ -51,7 +51,7 @@ RSpec.describe Gitlab::Database::BulkUpdate do
 
   it 'is possible to update all objects in a single query' do
     users = create_list(:user, 3)
-    mapping = users.zip(%w(foo bar baz)).to_h do |u, name|
+    mapping = users.zip(%w[foo bar baz]).to_h do |u, name|
       [u, { username: name, admin: true }]
     end
 
@@ -61,13 +61,13 @@ RSpec.describe Gitlab::Database::BulkUpdate do
 
     # We have optimistically updated the values
     expect(users).to all(be_admin)
-    expect(users.map(&:username)).to eq(%w(foo bar baz))
+    expect(users.map(&:username)).to eq(%w[foo bar baz])
 
     users.each(&:reset)
 
     # The values are correct on reset
     expect(users).to all(be_admin)
-    expect(users.map(&:username)).to eq(%w(foo bar baz))
+    expect(users.map(&:username)).to eq(%w[foo bar baz])
   end
 
   it 'is possible to update heterogeneous sets' do