lftp: update homepage

lftp.tech seems dead now ;
and use SPDX 3.0 license identifier

pkgs/tools/networking/lftp/default.nix

@@ -6,9 +6,8 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     urls = [
-      "https://lftp.tech/ftp/${pname}-${version}.tar.xz"
-      "https://ftp.st.ryukoku.ac.jp/pub/network/ftp/lftp/${pname}-${version}.tar.xz"
       "https://lftp.yar.ru/ftp/${pname}-${version}.tar.xz"
+      "https://ftp.st.ryukoku.ac.jp/pub/network/ftp/lftp/${pname}-${version}.tar.xz"
       ];
     sha256 = "03b7y0h3mf4jfq5y8zw6hv9v44z3n6i8hc1iswax96y3z7sc85y5";
   };
@@ -31,8 +30,8 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "A file transfer program supporting a number of network protocols";
-    homepage = "https://lftp.tech/";
-    license = licenses.gpl3;
+    homepage = "https://lftp.yar.ru/";
+    license = licenses.gpl3Plus;
     platforms = platforms.unix;
     maintainers = [ maintainers.bjornfor ];
   };