[nrfconnect] Fixed Python requirements for factory data generation

Recently the SetupPayload module has started utilizing `concrete`
package. As a result, it has became an indirect dependency of
implementation of the nrfconnect factory data generation.

Forward the `setup_payload/python/requirements.txt` to the nrfconnect
specific requirements as a fix.

Signed-off-by: Marcin Kajor <marcin.kajor@nordicsemi.no>

Author: markaj-nordic

scripts/setup/requirements.nrfconnect.txt

@@ -1,6 +1,7 @@
+-r requirements.setuppayload.txt
+
 jsonschema>=4.4.0
 cbor2>=5.4.3
 ecdsa>=0.18.0
 qrcode==7.4.2
-bitarray==2.6.0
 python_stdnum==1.18