swh-graphql: Adapt entrypoint according to latest change

Related to T4532
Related to D8374

apps/swh-graphql/entrypoint.sh

@@ -15,6 +15,7 @@ case "$1" in
     --log-level "${LOG_LEVEL}" \
     --timeout "${TIMEOUT}" \
     --config 'python:swh.core.api.gunicorn_config' \
+    --worker-class 'uvicorn.workers.UvicornWorker' \
     'swh.graphql.server:make_app_from_configfile()'
   ;;
 esac

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T4532 is now infra/sysadm-environment#4532