epson2: Add ET-2600 as supported

See https://gitlab.com/sane-project/backends/-/issues/395

backend/epson2_usb.c

@@ -21,6 +21,7 @@ SANE_Word sanei_epson_usb_product_ids[] = {
   0x112, /* GT-9700F, Perfection 2450 PHOTO */
   0x1120, /* L380 */
   0x1121, /* ET-2650, L495 */
+  0x1122, /* ET-2600 */
   0x113d, /* XP-255 */
   0x11b, /* GT-9300UF, Perfection 2400 PHOTO */
   0x11c, /* GT-9800F, Perfection 3200 PHOTO */

doc/descriptions/epson2.desc

@@ -528,6 +528,11 @@
 :status     :good
 :comment    "network interface supported via DFSG non-free iscan-network-nt package"
 
+:model      "ET-2600"
+:interface  "USB"
+:usbid      "0x04b8" "0x1122"
+:status     "good"
+
 :model      "ET-2650"
 :interface  "USB Ethernet"
 :usbid      "0x04b8" "0x1121"