Add DbModule import to GroupsModule

The DbModule import was moved to ensure proper load order and maintain consistency within the module imports. This change will help in avoiding potential dependency injection issues.

apps/backend/src/app/groups/groups.module.ts

@@ -1,7 +1,7 @@
 import { Module } from "@nestjs/common";
+import { DbModule } from "../db/db.module";
 import { GroupsController } from "./groups.controller";
 import { GroupsService } from "./groups.service";
-import { DbModule } from '../db/db.module';
 
 @Module({
 	imports: [DbModule],