Bump version of Flask-RESTX to 1.0.5.

This resolves all deprecation warnings caused by Flask-RESTX.

core/base/requirements-prod.txt

@@ -27,7 +27,7 @@ Flask-DebugToolbar==0.13.1
 Flask-Login==0.6.2
 flask-marshmallow==0.14.0
 Flask-Migrate==3.1.0
-Flask-RESTX==1.0.3
+Flask-RESTX==1.0.5
 Flask-SQLAlchemy==2.5.1
 Flask-WTF==1.0.1
 frozenlist==1.3.1