libblockdev: 2.18 -> 2.19 (#45193)

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/libblockdev/versions.

pkgs/development/libraries/libblockdev/default.nix

···
 }:
 
 let
-  version = "2.18";
+  version = "2.19";
 in stdenv.mkDerivation rec {
   name = "libblockdev-${version}";
 
···
     owner = "storaged-project";
     repo = "libblockdev";
     rev = "${version}-1";
-    sha256 = "03gbmji401nz1sff2zp61dhal80qls4blqwadj2p4ckbxdlmid4i";
+    sha256 = "1ny31vaarzbpw0h863p2r5cvjsfs77d33nnisf8bhjc6ps6js3ys";
   };
 
   outputs = [ "out" "dev" "devdoc" ];