epson-201106w: added mirror url for src

+ added webarchive source for reliable builds in the future

pkgs/misc/drivers/epson-201106w/default.nix

···
     inherit version;
 
     src = fetchurl {
-      url = "https://download.ebz.epson.net/dsc/op/stable/SRPMS/epson-inkjet-printer-201106w-${version}-1lsb3.2.src.rpm";
+      # NOTE: Don't forget to update the webarchive link too!
+      urls = [
+        "https://download.ebz.epson.net/dsc/op/stable/SRPMS/epson-inkjet-printer-201106w-${version}-1lsb3.2.src.rpm"
+        "https://web.archive.org/web/https://download.ebz.epson.net/dsc/op/stable/SRPMS/epson-inkjet-printer-201106w-${version}-1lsb3.2.src.rpm"     
+      ];
+
       sha256 = "1yig1xrh1ikblbp7sx706n5nnc237wy4mbch23ymy6akbgqg4aig";
     };