RUBY-2035 Use URI::DEFAULT_PARSER.unescape instead of URI.decode for Ruby 2.7 (#1614)

Author: p-mongo

lib/mongo/uri.rb

@@ -454,7 +454,7 @@ def raise_invalid_error_no_fmt!(details)
     end
 
     def decode(value)
-      ::URI.decode(value)
+      ::URI::DEFAULT_PARSER.unescape(value)
     end
 
     def encode(value)

spec/mongo/uri_spec.rb

@@ -352,7 +352,7 @@
       let(:servers) { '%2Ftmp%2Fmongodb-27017.sock' }
 
       it 'returns an array with the parsed server' do
-        expect(uri.servers).to eq([URI.unescape(servers)])
+        expect(uri.servers).to eq([URI::DEFAULT_PARSER.unescape(servers)])
       end
     end