fix(package): update pg-promise to version 6.3.0 (#3982)

* fix(package): update pg-promise to version 6.3.0

Closes #3954

* Restores PG adapter after tests that close the connection

* investigation

* Use isolated parse-server to not impeed on other specs

* Update PostgresInitOptions.spec.js

spec/helper.js

@@ -189,12 +189,7 @@ beforeEach(done => {
       Parse.initialize('test', 'test', 'test');
       Parse.serverURL = 'http://localhost:' + port + '/1';
       done();
-    }, () => {
-      Parse.initialize('test', 'test', 'test');
-      Parse.serverURL = 'http://localhost:' + port + '/1';
-      // fail(JSON.stringify(error));
-      done();
-    })
+    }).catch(done.fail);
 });
 
 afterEach(function(done) {