treewide: adopt a few packages that sandro dropped maintainership for

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

···
 , importlib-metadata
 , pytestCheckHook
 
-# large-rebuild downstream dependencies and applications
+  # large-rebuild downstream dependencies and applications
 , flask
 , black
 , magic-wormhole
···
       composable way, with as little code as necessary.
     '';
     license = licenses.bsd3;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

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

···
     homepage = "https://salsa.debian.org/python-debian-team/python-debian";
     changelog = "https://salsa.debian.org/python-debian-team/python-debian/-/blob/master/debian/changelog";
     license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

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

···
     description = "EditorConfig File Locator and Interpreter for Python";
     homepage = "https://github.com/editorconfig/editorconfig-core-py";
     license = licenses.psfl;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

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

···
       Python web application frameworks.
     '';
     license = licenses.bsd3;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

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

···
     homepage = "https://github.com/msgpack/msgpack-python";
     changelog = "https://github.com/msgpack/msgpack-python/blob/v${version}/ChangeLog.rst";
     license = licenses.asl20;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

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

···
     description = "Interface Python with pkg-config";
     homepage = "https://github.com/matze/pkgconfig";
     license = licenses.mit;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

pkgs/development/python-modules/setuptools-scm/default.nix

···
     homepage = "https://github.com/pypa/setuptools_scm/";
     description = "Handles managing your python package versions in scm metadata";
     license = licenses.mit;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }

pkgs/tools/system/tree/default.nix

···
       the LS_COLORS environment variable is set and output is to tty.
     '';
     platforms = platforms.all;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }