Skip flaky test until we revisit it (#1008)

This is the single flaky test that keeps annoying us #945

We need to revisit it

Author: ktoso

Tests/DistributedActorsTests/Cluster/ClusterLeaderActionsClusteredTests.swift

@@ -23,6 +23,8 @@ final class ClusterLeaderActionsClusteredTests: ClusteredActorSystemsXCTestCase
     // MARK: leader decision: .joining -> .up
 
     func test_singleLeader() async throws {
+        throw XCTSkip("!!! Skipping known flaky test \(#function) !!!") // FIXME(distributed): revisit and fix https://github.com/apple/swift-distributed-actors/issues/945
+
         let first = await setUpNode("first") { settings in
             settings.node.port = 7111
             settings.autoLeaderElection = .lowestReachable(minNumberOfMembers: 1)