dpkg: 1.20.9ubuntu2 -> 1.21.1ubuntu2.1

Fixes https://nvd.nist.gov/vuln/detail/CVE-2022-1664
See also https://ubuntu.com/security/notices/USN-5446-1

pkgs/tools/package-management/dpkg/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "dpkg";
-  version = "1.20.9ubuntu2";
+  version = "1.21.1ubuntu2.1";
 
   src = fetchurl {
     url = "mirror://ubuntu/pool/main/d/dpkg/dpkg_${version}.tar.xz";
-    sha256 = "sha256-BuCofGpi9R0cyhvkZqu9IxupqZvZhbE2J/B4wgUqMQw=";
+    sha256 = "sha256-YvVQbQn2MhOIOE43VO0H1QsKIYCsjNAFzKMoFeSrqZk=";
   };
 
   configureFlags = [