refactor: replace time.Sleep with synctest.Wait in UpdateHandler tests

Author: akrem-chabchoub

pkg/accesscontrol/controller_test.go

@@ -243,12 +243,12 @@ func TestController_UpdateHandler(t *testing.T) {
 			require.NoError(t, err)
 
 			// Need to wait a second before each update call so that a new history mantaray fork is created for the new key(timestamp) entry
-			time.Sleep(1 * time.Second)
+			synctest.Wait()
 			beforeRevokeTS := time.Now().Unix()
 			_, egranteeRef, hrefUpdate1, _, err := c.UpdateHandler(ctx, ls, gls, swarm.ZeroAddress, hRef, &publisher.PublicKey, addRevokeList, nil)
 			require.NoError(t, err)
 
-			time.Sleep(1 * time.Second)
+			synctest.Wait()
 			granteeRef, _, hrefUpdate2, _, err := c.UpdateHandler(ctx, ls, gls, egranteeRef, hrefUpdate1, &publisher.PublicKey, nil, addRevokeList)
 			require.NoError(t, err)