postgresql: 16.4 -> 17.0

As discussed in [1] this change is decoupled from the major version
update for the NixOS postgresql module.

[1]: https://github.com/NixOS/nixpkgs/pull/329611/files#r1701393693

pkgs/top-level/all-packages.nix

@@ -24868,8 +24868,8 @@ with pkgs;
     postgresql_16_jit
     postgresql_17_jit
   ;
-  postgresql = postgresql_16;
-  postgresql_jit = postgresql_16_jit;
+  postgresql = postgresql_17;
+  postgresql_jit = postgresql_17_jit;
   postgresqlPackages = recurseIntoAttrs postgresql.pkgs;
   postgresqlJitPackages = recurseIntoAttrs postgresql_jit.pkgs;
   postgresql12Packages = recurseIntoAttrs postgresql_12.pkgs;