Fix `/versions` requests (#17410)

We need it to work on workers and allow guest access.

Broke by #17392

changelog.d/17410.misc

@@ -0,0 +1 @@
+Finish up work to allow per-user feature flags.

synapse/app/generic_worker.py

@@ -74,6 +74,9 @@ from synapse.storage.databases.main.event_push_actions import (
     EventPushActionsWorkerStore,
 )
 from synapse.storage.databases.main.events_worker import EventsWorkerStore
+from synapse.storage.databases.main.experimental_features import (
+    ExperimentalFeaturesStore,
+)
 from synapse.storage.databases.main.filtering import FilteringWorkerStore
 from synapse.storage.databases.main.keys import KeyStore
 from synapse.storage.databases.main.lock import LockStore
@@ -155,6 +158,7 @@ class GenericWorkerStore(
     LockStore,
     SessionStore,
     TaskSchedulerWorkerStore,
+    ExperimentalFeaturesStore,
 ):
     # Properties that multiple storage classes define. Tell mypy what the
     # expected type is.

synapse/rest/client/versions.py

@@ -66,7 +66,12 @@ class VersionsRestServlet(RestServlet):
         msc3881_enabled = self.config.experimental.msc3881_enabled
 
         if self.auth.has_access_token(request):
-            requester = await self.auth.get_user_by_req(request)
+            requester = await self.auth.get_user_by_req(
+                request,
+                allow_guest=True,
+                allow_locked=True,
+                allow_expired=True,
+            )
             user_id = requester.user.to_string()
 
             msc3881_enabled = await self.store.is_feature_enabled(