Modernize for loop

src/handlers/sheets.go

@@ -141,7 +141,7 @@ func DownloadSheet(c *gin.Context) {
 }
 
 func GenerateNonexistentSheetUuid() (*uuid.UUID, error) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		uuid := uuid.New()
 
 		var exists bool