poppler: 20.08.0 -> 20.12.1

- 20.09.0: https://lists.freedesktop.org/archives/poppler/2020-September/014432.html
- 20.10.0: https://lists.freedesktop.org/archives/poppler/2020-October/014467.html
- 20.11.0: https://lists.freedesktop.org/archives/poppler/2020-November/014499.html
- 20.12.0: https://lists.freedesktop.org/archives/poppler/2020-December/014546.html
- 20.12.1: https://lists.freedesktop.org/archives/poppler/2020-December/014562.html

pkgs/development/libraries/poppler/default.nix

@@ -12,11 +12,11 @@ let
 in
 stdenv.mkDerivation rec {
   name = "poppler-${suffix}-${version}";
-  version = "20.08.0"; # beware: updates often break cups-filters build, check texlive and scribusUnstable too!
+  version = "20.12.1"; # beware: updates often break cups-filters build, check texlive and scribusUnstable too!
 
   src = fetchurl {
     url = "${meta.homepage}/poppler-${version}.tar.xz";
-    sha256 = "19gchq6fpa00ic5rn1zmjzxx85cif4hbdrsjcfd2aqxz9gqgwrdf";
+    sha256 = "0dbv1y9i5ahg6namz6gw2d0njnmrigr4a80dbxvnqad4q232banh";
   };
 
   outputs = [ "out" "dev" ];