ephemeralpg: 2.2 -> 2.5 (#43207)

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

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

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/xx8s6cx068zvag43h4aimx5bmfrjbdim-ephemeralpg-2.5/bin/pg_tmp had a zero exit code or showed the expected version
- /nix/store/xx8s6cx068zvag43h4aimx5bmfrjbdim-ephemeralpg-2.5/bin/getsocket passed the binary check.
- Warning: no invocation of /nix/store/xx8s6cx068zvag43h4aimx5bmfrjbdim-ephemeralpg-2.5/bin/.pg_tmp-wrapped had a zero exit code or showed the expected version
- 1 of 3 passed binary check by having a zero exit code.
- 0 of 3 passed binary check by having the new version present in output.
- found 2.5 with grep in /nix/store/xx8s6cx068zvag43h4aimx5bmfrjbdim-ephemeralpg-2.5
- directory tree listing: https://gist.github.com/ef7c65928ca73f639338d8dd6d45f9aa
- du listing: https://gist.github.com/74d9b22fa087781cb35087ad48fefaa3