nip2: 8.7.1 -> 8.9.1

pkgs/tools/graphics/nip2/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "nip2";
-  version = "8.7.1";
+  version = "8.9.1";
 
   src = fetchurl {
     url = "https://github.com/libvips/nip2/releases/download/v${version}/nip2-${version}.tar.gz";
-    sha256 = "0l7n427njif53npqn02gfjjly8y3khbrkzqxp10j5vp9h97psgiw";
+    sha256 = "sha256-t14m6z+5lPqpiOjgdDbKwqSWXCyrCL7zlo6BeoZtds0=";
   };
 
   nativeBuildInputs = [