OWNERS: add postgresqlTestHook to NixOS/postgres team

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ci/OWNERS
··· 251 /maintainers/scripts/kde @K900 @NickCao @SuperSandro2000 @ttuegel 252 253 # PostgreSQL and related stuff 254 /pkgs/by-name/ps/psqlodbc @NixOS/postgres 255 /pkgs/servers/sql/postgresql @NixOS/postgres 256 /pkgs/development/tools/rust/cargo-pgrx @NixOS/postgres
··· 251 /maintainers/scripts/kde @K900 @NickCao @SuperSandro2000 @ttuegel 252 253 # PostgreSQL and related stuff 254 + /pkgs/by-name/po/postgresqlTestHook @NixOS/postgres 255 /pkgs/by-name/ps/psqlodbc @NixOS/postgres 256 /pkgs/servers/sql/postgresql @NixOS/postgres 257 /pkgs/development/tools/rust/cargo-pgrx @NixOS/postgres