Unmaintain packages I don't use anymore

Just got a reminder via the vulnerability roundup[1] that I'm still
listed as maintainer for Synergy, even though I stopped using it years
ago.

I'll also take this as an opportunity to remove myself from other
packages which I stopped using and thus most certainly won't be able to
maintain. The latter is already hard enough these days for software
which I *do* use.

[1]: https://github.com/NixOS/nixpkgs/issues/94007

Signed-off-by: aszlig <aszlig@nix.build>

pkgs/development/python-modules/ecdsa/default.nix

@@ -22,7 +22,6 @@ buildPythonPackage rec {
     description = "ECDSA cryptographic signature library";
     homepage = "https://github.com/warner/python-ecdsa";
     license = licenses.mit;
-    maintainers = with maintainers; [ aszlig ];
   };
 
 }