Fix Gitlab::Database.bulk_insert for non-UTF-8 data

lib/gitlab/database.rb

@@ -93,7 +93,7 @@ module Gitlab
         row.values_at(*keys).map { |value| connection.quote(value) }
       end
 
-      connection.execute <<-EOF.strip_heredoc
+      connection.execute <<-EOF
         INSERT INTO #{table} (#{columns.join(', ')})
         VALUES #{tuples.map { |tuple| "(#{tuple.join(', ')})" }.join(', ')}
       EOF

spec/lib/gitlab/database_spec.rb

@@ -176,6 +176,10 @@ describe Gitlab::Database, lib: true do
 
       described_class.bulk_insert('test', rows)
     end
+
+    it 'handles non-UTF-8 data' do
+      expect { described_class.bulk_insert('test', [{ a: "\255" }]) }.not_to raise_error
+    end
   end
 
   describe '.create_connection_pool' do