treewide: remove unused with statements from maintainer lists

$ find -type f -name '*.nix' -print0 | xargs -P "$(nproc)" -0 sed -i \
  -e 's!with lib.maintainers; \[ *\];![ ];!' \
  -e 's!with maintainers; \[ *\];![ ];!'

pkgs/development/python-modules/astropy-iers-data/default.nix

@@ -37,6 +37,6 @@ buildPythonPackage rec {
     description = "IERS data maintained by @astrofrog and astropy.utils.iers maintainers";
     homepage = "https://github.com/astropy/astropy-iers-data";
     license = licenses.bsd3;
-    maintainers = with maintainers; [ ];
+    maintainers = [ ];
   };
 }