docs(association): document uniqueKey for belongs to many (#12166)

docs/manual/core-concepts/assocs.md

@@ -308,6 +308,12 @@ CREATE TABLE IF NOT EXISTS "ActorMovies" (
 
 Unlike One-To-One and One-To-Many relationships, the defaults for both `ON UPDATE` and `ON DELETE` are `CASCADE` for Many-To-Many relationships.
 
+Belongs-To-Many creates a unique key when primary key is not present on through model. This unique key name can be overridden using **uniqueKey** option.
+
+```js
+Project.belongsToMany(User, { through: UserProjects, uniqueKey: 'my_custom_unique' })
+```
+
 ## Basics of queries involving associations
 
 With the basics of defining associations covered, we can look at queries involving associations. The most common queries on this matter are the *read* queries (i.e. SELECTs). Later on, other types of queries will be shown.

package.json

@@ -88,7 +88,7 @@
     "semantic-release": "^17.0.7",
     "sinon": "^9.0.2",
     "sinon-chai": "^3.3.0",
-    "sqlite3": "^4.0.6",
+    "sqlite3": "^4.1.1",
     "tedious": "6.0.0",
     "typescript": "^3.6.3"
   },