Roll back to django-oauth-toolkit 1.7.0

The arches test suite suggests we are affected by the
breaking changes in 2.x. Although only the 2.x series
declares support for Django 4.1, the PR to declare it
support made no substantive changes.

arches/install/requirements.txt

@@ -12,7 +12,7 @@ django-recaptcha==3.0.0
 edtf==4.0.1
 arches-django-revproxy==0.10.0
 django-cors-headers==4.2.0
-django-oauth-toolkit==2.3.0
+django-oauth-toolkit==1.7.0
 polib==1.1.1
 PyLD[requests]==1.0.5
 pyprind==2.11.3