maintainers: drop gbpdt

Inactive since 2023/2024, does not react to maintainer pings.

maintainers/maintainer-list.nix

@@ -9351,12 +9351,6 @@
     githubId = 16470252;
     name = "Gemini Lasswell";
   };
-  gbpdt = {
-    email = "nix@pdtpartners.com";
-    github = "gbpdt";
-    githubId = 25106405;
-    name = "Graham Bennett";
-  };
   gbtb = {
     email = "goodbetterthebeast3@gmail.com";
     github = "gbtb";

pkgs/by-name/ap/apache-airflow/python-package.nix

@@ -346,7 +346,6 @@ buildPythonPackage rec {
     changelog = "https://airflow.apache.org/docs/apache-airflow/${version}/release_notes.html";
     license = lib.licenses.asl20;
     maintainers = with lib.maintainers; [
-      gbpdt
       taranarmo
     ];
   };