fix: use github version of py2neo instead of PyPI

The version of Py2neo we depend on has been removed from PyPI.  This is
a stop-gap until we can upgrade it

requirements/edx/base.in

@@ -119,7 +119,6 @@ openedx-calc                        # Library supporting mathematical calculatio
 ora2
 piexif                              # Exif image metadata manipulation, used in the profile_images app
 Pillow                              # Image manipulation library; used for course assets, profile images, invoice PDFs, etc.
-py2neo<4.0.0                        # Used to communicate with Neo4j, which is used internally for modulestore inspection
 PyContracts
 pycountry
 pycryptodomex

requirements/edx/github.in

@@ -57,6 +57,7 @@
 -e git+https://github.com/edx/django-wiki.git@1.0.0#egg=django-wiki
 git+https://github.com/edx/MongoDBProxy.git@d92bafe9888d2940f647a7b2b2383b29c752f35a#egg=MongoDBProxy==0.1.0+edx.2
 -e git+https://github.com/jazkarta/edx-jsme.git@690dbf75441fa91c7c4899df0b83d77f7deb5458#egg=edx-jsme
+-e git+https://github.com/technige/py2neo.git@py2neo-3.1.2#egg=py2neo==3.1.2
 
 # This is a temporary fork until https://github.com/brutasse/django-ratelimit-backend/pull/50 is merged
 # back into the upstream code.