upgrading pg to 8.8.0 to support new scram-sha-256 authentication

this fixes "error: 	uncaughtException: Unknown authenticationOk message typeMessage { name: 'authenticationOk', length: 23 }"

Author: phntom

package.json

@@ -86,7 +86,7 @@
     "passport-saml": "~1.0.0",
     "passport-twitter": "~1.0.4",
     "passport.socketio": "~3.7.0",
-    "pg": "~6.1.2",
+    "pg": "~8.8.0",
     "pg-hstore": "~2.3.2",
     "prom-client": "^12.0.0",
     "prometheus-api-metrics": "^2.2.5",
@@ -95,7 +95,7 @@
     "readline-sync": "~1.4.7",
     "request": "~2.88.0",
     "scrypt-kdf": "^2.0.1",
-    "sequelize": "5.21.3",
+    "sequelize": "5.21.13",
     "sequelize-cli": "~5.5.1",
     "shortid": "~2.2.14",
     "socket.io": "~2.2.0",