fix: revert locking in getclusteraccessor

Signed-off-by: Lukas Wöhrl <[email protected]>

controller/sharding/cache.go

@@ -154,8 +154,7 @@ func hasShardingUpdates(old, new *v1alpha1.Cluster) bool {
 
 func (d *ClusterSharding) GetClusterAccessor() clusterAccessor {
 	return func() []*v1alpha1.Cluster {
-		d.lock.RLock()
-		defer d.lock.RUnlock()
+		// no need to lock, as this is only called from the updateDistribution function
 		clusters := make([]*v1alpha1.Cluster, 0, len(d.Clusters))
 		for _, c := range d.Clusters {
 			clusters = append(clusters, c)