Reorder imports in groups.dto.ts

Rearranged the imports in `groups.dto.ts` to maintain alphabetical order and used double quotes for consistency with the rest of the project. This change does not alter functionality but improves code readability and maintainability.

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

@@ -1,8 +1,8 @@
-import { IsString, MinLength, MaxLength } from 'class-validator';
+import { IsString, MaxLength, MinLength } from "class-validator";
 
 export class CreateGroupDto {
-  @IsString()
-  @MinLength(4)
-  @MaxLength(64)
-  groupName: string;
+	@IsString()
+	@MinLength(4)
+	@MaxLength(64)
+	groupName: string;
 }