Same problem for me.
I used this flag:
pip3 install Adafruit_DHT --config-settings="--build-option=--force-pi"
Here is how to pass an argument to the setup script: https://github.com/pypa/pip/issues/11358#issuecomment-1493207214
Here is how to force a specific platform: https://github.com/adafruit/Adafruit_Python_DHT/blob/8f5e2c4d6ebba8836f6d31ec9a0c171948e3237d/setup.py#L33