[chores] Update requirements.txt

Author: nemesifier

requirements.txt

@@ -1,5 +1,5 @@
 openwisp-users @ https://github.com/openwisp/openwisp-users/tarball/1.2
-netdiff @ https://github.com/openwisp/netdiff/tarball/issues/129-python3.13
+netdiff @ https://github.com/openwisp/netdiff/tarball/1.2
 jsonfield~=3.1.0
 django-flat-json-widget~=0.3.1
 openwisp-utils[celery,channels] @ https://github.com/openwisp/openwisp-utils/tarball/1.2