postgresql: use team

Main motivation for this is that I'd like to get a feature-freeze ping:
we have old stuff to remove and quite a bit of things ongoing here, so
explicitly being part of the check-up process seems like a good thing.

Also added myself and wolfgangwalther to it.

maintainers/team-list.nix

@@ -845,9 +845,10 @@ with lib.maintainers;
   };
 
   postgres = {
-    members = [ thoughtpolice ];
+    members = [ thoughtpolice ma27 wolfgangwalther ];
     scope = "Maintain the PostgreSQL package and plugins along with the NixOS module.";
     shortName = "PostgreSQL";
+    enableFeatureFreezePing = true;
   };
 
   python = {

pkgs/servers/sql/postgresql/generic.nix

@@ -320,7 +320,7 @@ let
       description = "Powerful, open source object-relational database system";
       license     = licenses.postgresql;
       changelog   = "https://www.postgresql.org/docs/release/${finalAttrs.version}/";
-      maintainers = with maintainers; [ thoughtpolice danbst globin ivan ma27 wolfgangwalther ];
+      maintainers = with maintainers; [ danbst globin ivan ] ++ teams.postgres.members;
       pkgConfigModules = [ "libecpg" "libecpg_compat" "libpgtypes" "libpq" ];
       platforms   = platforms.unix;