Use modern for loops

Go 1.22 introduced a new [for-range](https://go.dev/ref/spec#For_range)
construct that looks a tad better than the usual `for i := 0; i < N; i++`
construct. I also tool the liberty of replacing some
`for i := 0; i < len(myitemsarray); i++ { … myitemsarray[i] …}`
with  `for item := range myitemsarray` when `myitemsarray` contains only pointers.

internal/worker/pool.go

@@ -26,7 +26,7 @@ func NewPool(store *storage.Storage, nbWorkers int) *Pool {
 		queue: make(chan model.Job),
 	}
 
-	for i := 0; i < nbWorkers; i++ {
+	for i := range nbWorkers {
 		worker := &Worker{id: i, store: store}
 		go worker.Run(workerPool.queue)
 	}