platformio: disable version check

reimplements #232356

pkgs/development/embedded/platformio/core.nix

···
     })
   ];
 
+  postPatch = ''
+    # Disable update checks at runtime
+    substituteInPlace platformio/maintenance.py --replace-fail '    check_platformio_upgrade()' ""
+  '';
+
   nativeBuildInputs = [
     installShellFiles
     pythonRelaxDepsHook