dspace_statistics_api/app.py: don't use psycopg2.extras.register_uuid()

In psycogp version 3 we can use native Python UUIDs without special
handling.

dspace_statistics_api/app.py

@@ -4,7 +4,6 @@ import json
 import math
 
 import falcon
-import psycopg2.extras
 from falcon_swagger_ui import register_swaggerui_app
 
 from .config import DSPACE_STATISTICS_API_URL, VERSION
@@ -185,10 +184,6 @@ class SingleStatisticsResource:
     def on_get(self, req, resp, id_):
         """Handles GET requests"""
 
-        # Adapt Python’s uuid.UUID type to PostgreSQL’s uuid
-        # See: https://www.psycopg.org/docs/extras.html
-        psycopg2.extras.register_uuid()
-
         with DatabaseManager() as db:
             db.set_read_only(True)