perlPackages.ImageMagick: 7.1.1-18 -> 7.1.1-20

pkgs/top-level/perl-packages.nix

···
   PerlMagick = ImageMagick; # added 2021-08-02
   ImageMagick = buildPerlPackage rec {
     pname = "Image-Magick";
-    version = "7.1.1-18";
+    version = "7.1.1-20";
     src = fetchurl {
       url = "mirror://cpan/authors/id/J/JC/JCRISTY/Image-Magick-${version}.tar.gz";
-      hash = "sha256-42mvGP4FkY/YfPOh/jRiUFWdDk+S2oB0Jfqv30AAlxw=";
+      hash = "sha256-oMAwXQBxuV2FgPHBhUi+toNFPVnRLNjZqdP2q+ki6jg=";
     };
     buildInputs = [ pkgs.imagemagick ];
     preConfigure =