powerdns: removed PrivateTmp=true in serviceConfig

As discussed in #18718 PrivateTmp is unnecessary because powerdns is
chrooted to /var/lib/powerdns.

I also added myself as co-maintainer.

pkgs/servers/dns/powerdns/default.nix

@@ -36,6 +36,6 @@ stdenv.mkDerivation rec {
     platforms = platforms.linux;
     # cannot find postgresql libs on macos x
     license = licenses.gpl2;
-    maintainers = [ maintainers.mic92 ];
+    maintainers = [ maintainers.mic92 maintainers.nhooyr ];
   };
 }