Update upstream.repos

Author: sea-bass

.github/upstream.repos

@@ -30,10 +30,3 @@ repositories:
     type: git
     url: https://github.com/tylerjw/serial.git
     version: ros2
-  # This package was removed from binaries in the 2025-02-03 Rolling sync.
-  # If/when https://github.com/PickNikRobotics/picknik_controllers/pull/14 is merged and the package is re-added,
-  # we can remove from this list.
-  picknik_controllers:
-    type: git
-    url: https://github.com/sea-bass/picknik_controllers.git
-    version: fix-deprecated-realtime-tools-imports