fix: downgrade netboxlabs-netbox-branching to version 0.5.7

Signed-off-by: Michal Fiedorowicz <mfiedorowicz@netboxlabs.com>

Author: mfiedorowicz

docker/v4.2.3/requirements-diode-netbox-plugin.txt

@@ -4,4 +4,4 @@ coverage==7.6.0
 grpcio==1.62.1
 protobuf==5.29.5
 pytest==8.0.2
-netboxlabs-netbox-branching==0.7.1
+netboxlabs-netbox-branching==0.5.7