libpqxx: 6.1.1 -> 6.2.2

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/libpqxx/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/hzcqfnjvh2k4zdqzqd4wpqwcm07ykfj1-libpqxx-6.2.2/bin/pqxx-config -h’ got 0 exit code
- ran ‘/nix/store/hzcqfnjvh2k4zdqzqd4wpqwcm07ykfj1-libpqxx-6.2.2/bin/pqxx-config --help’ got 0 exit code
- ran ‘/nix/store/hzcqfnjvh2k4zdqzqd4wpqwcm07ykfj1-libpqxx-6.2.2/bin/pqxx-config help’ got 0 exit code
- found 6.2.2 with grep in /nix/store/hzcqfnjvh2k4zdqzqd4wpqwcm07ykfj1-libpqxx-6.2.2
- directory tree listing: https://gist.github.com/1762ec20b50f90dcc2837560c260d785

pkgs/development/libraries/libpqxx/default.nix

@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   name = "libpqxx-${version}";
-  version = "6.1.1";
+  version = "6.2.2";
 
   src = fetchFromGitHub {
     owner = "jtv";
     repo = "libpqxx";
     rev = version;
-    sha256 = "0yw0wvnpw0j560f5zv4gvmafi19d9hrknwjzl7qrss926aqx65jq";
+    sha256 = "0f7mkl29v6d47kkdpl2gkb9xc5lnih2pq9pk3cq6nc2j6w758yp5";
   };
 
   nativeBuildInputs = [ gnused python2 ];