augeas: clarify license

> Augeas is distributed under the GNU Lesser General Public
> License (LGPL) version 2.1.

https://augeas.net/faq.html

pkgs/tools/system/augeas/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Configuration editing tool";
-    license = licenses.lgpl2;
+    license = licenses.lgpl21Only;
     homepage = "http://augeas.net/";
     maintainers = with maintainers; [ offline ];
     platforms = platforms.unix;