Pin rq version

rq 1.16 got released on Saturday morning, and our CI has been failing since Saturday at noon. We only have django-rq as a dependency, which depends on rq>=1.14.

requirements.txt

@@ -14,6 +14,7 @@ python-memcached==1.59
 pytz==2023.3
 PyYAML==6.0
 requests==2.28.2
+rq==1.15.1
 sentry-sdk==1.31.0
 setproctitle==1.3.2
 SolrClient==0.3.1