fix(libp2p): Updating nim-libp2p to fix the wss connectivity issue (#…

…1848)

* Updating nim-libp2p to fix the `wss` connectivity issue

* The `nim-libp2p` adds many changes although we are actually interested
in the latest commit:

> wstransport.nim: avoid re-raising 'TransportOsError' to avoid stopping
`switch.accept` (#929)

* The `nim-stew` bump is needed so that the `nim-libp2p` can compile.

* The changes in `waku_node.nim` are needed due to the changes in
`nim-stew`.

* waku_node.nim: returning a "completed" future within 'statusAndConfidenceHandler'

  This is aimed to avoid the next exception happening in the wakunode:

  ```
  Unhandled defect: Async procedure (service.nim(74)    callHandler)
  yielded `nil`, are you await'ing a `nil` Future? [AssertionDefect]
  ```

  * Adding 'async' to 'statusAndConfidenceHandler' so that it properly returns a Future[void]

waku/v2/node/waku_node.nim

@@ -113,13 +113,15 @@ proc getAutonatService*(rng: ref HmacDrbgContext): AutonatService =
   let autonatService = AutonatService.new(
     autonatClient = AutonatClient.new(),
     rng = rng,
-    scheduleInterval = some(chronos.seconds(120)),
+    scheduleInterval = Opt.some(chronos.seconds(120)),
     askNewConnectedPeers = false,
     numPeersToAsk = 3,
     maxQueueSize = 3,
     minConfidence = 0.7)
 
-  proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+  proc statusAndConfidenceHandler(networkReachability: NetworkReachability,
+                                  confidence: Opt[float]):
+                                  Future[void]  {.gcsafe, async.} =
     if confidence.isSome():
       info "Peer reachability status", networkReachability=networkReachability, confidence=confidence.get()