Fork of AAI Disable Deadzone by Shekkie, updated to work for 2.1 since the original is only for 2.0.
https://mods.factorio.com/mod/aai-programmable-vehicles-disable-deadzone

Shekkie's description:
AAI Programmable Vehicles defines a no-build deadzone around hostile forces to "prevent turret creep" with no way to disable this. This mod adds all entities in the game to the built in allow-list, effectively disabling the deadzone.