fix: Constrain watch type parameter to extend ChangeStream type parameter

Author: eps1lon

src/db.ts

@@ -722,7 +722,7 @@ export class Db {
    * @param pipeline - An array of {@link https://docs.mongodb.com/manual/reference/operator/aggregation-pipeline/|aggregation pipeline stages} through which to pass change stream documents. This allows for filtering (using $match) and manipulating the change stream documents.
    * @param options - Optional settings for the command
    */
-  watch<TSchema = Document>(
+  watch<TSchema extends Document = Document>(
     pipeline: Document[] = [],
     options: ChangeStreamOptions = {}
   ): ChangeStream<TSchema> {