feat(monorepo): add riverqueue/river monorepo (#31649)

lib/data/monorepo.json

@@ -451,6 +451,7 @@
     "remark": "https://github.com/remarkjs/remark",
     "remix": "https://github.com/remix-run/remix",
     "retrofit": "https://github.com/square/retrofit",
+    "river": "https://github.com/riverqueue/river",
     "rjsf": "https://github.com/rjsf-team/react-jsonschema-form",
     "router5": "https://github.com/router5/router5",
     "ruby-on-rails": "https://github.com/rails/rails",