fix(scim): match user_name collate expression to migrations

Author: xlgmokha

internal/api/scim/user_repository.go

@@ -19,7 +19,7 @@ var ErrNotFound = errors.New("scim: resource not found")
 
 var userSortColumns = map[string]string{
 	"id":                "id",
-	"username":          `lower(user_name) collate "C"`,
+	"username":          `lower(user_name collate "C")`,
 	"meta.created":      "created_at",
 	"meta.lastmodified": "updated_at",
 }