Only require room version instead of room info for db.Events() (#3079)

This reduces the API requirements for the Events database to align with
what is actually required.

roomserver/internal/input/input_events.go

@@ -805,7 +805,10 @@ func (r *Inputer) kickGuests(ctx context.Context, event gomatrixserverlib.PDU, r
 		return err
 	}
 
-	memberEvents, err := r.DB.Events(ctx, roomInfo, membershipNIDs)
+	if roomInfo == nil {
+		return types.ErrorInvalidRoomInfo
+	}
+	memberEvents, err := r.DB.Events(ctx, roomInfo.RoomVersion, membershipNIDs)
 	if err != nil {
 		return err
 	}

roomserver/internal/input/input_membership.go

@@ -55,7 +55,7 @@ func (r *Inputer) updateMemberships(
 	// Load the event JSON so we can look up the "membership" key.
 	// TODO: Maybe add a membership key to the events table so we can load that
 	// key without having to load the entire event JSON?
-	events, err := updater.Events(ctx, nil, eventNIDs)
+	events, err := updater.Events(ctx, "", eventNIDs)
 	if err != nil {
 		return nil, err
 	}

roomserver/internal/input/input_missing.go

@@ -398,7 +398,10 @@ func (t *missingStateReq) lookupStateAfterEventLocally(ctx context.Context, even
 	for _, entry := range stateEntries {
 		stateEventNIDs = append(stateEventNIDs, entry.EventNID)
 	}
-	stateEvents, err := t.db.Events(ctx, t.roomInfo, stateEventNIDs)
+	if t.roomInfo == nil {
+		return nil
+	}
+	stateEvents, err := t.db.Events(ctx, t.roomInfo.RoomVersion, stateEventNIDs)
 	if err != nil {
 		t.log.WithError(err).Warnf("failed to load state events locally")
 		return nil