pg_repack: 1.4.2 -> 1.4.3

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

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

These checks were done:

- built on NixOS
- /nix/store/08l7mgizcwhz3iiq7q53529mnj0z9apl-pg_repack-1.4.3/bin/pg_repack passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 1 of 1 passed binary check by having the new version present in output.
- found 1.4.3 with grep in /nix/store/08l7mgizcwhz3iiq7q53529mnj0z9apl-pg_repack-1.4.3
- directory tree listing: https://gist.github.com/98848a9a560aa1d4de3e164197944d32
- du listing: https://gist.github.com/cfef5141050a394c88b04b839ec17fdf