Update CONTRIBUTING.md with new postgres version (#878)

CONTRIBUTING.md

@@ -29,7 +29,7 @@ Make sure you can run these commands and install them if not present.
 
 ### Database
 
-* [PostgreSQL 14](https://www.postgresql.org/download/)
+* [PostgreSQL 16](https://www.postgresql.org/download/)
 * [PgAdmin4](https://www.pgadmin.org/download/)
 
 ## Get a Discord bot token and enable intents
@@ -153,4 +153,4 @@ Here are some common scenarios and what portions of ClemBot you need to have run
 | Dashboard bug fix/feature               | Yes         | Yes         | Yes          |
 
 In instances where **ClemBot.Bot** is not using **ClemBot.Api**, the `BotOnly` setting in the `BotSecrets.json` file can
-be toggled to `true` and vice versa.
+be toggled to `true` and vice versa.