Replace deprecated spl_object_hash() with spl_object_id() in ConnectionErrorProof (#1738)

php 8.6 deprecates spl_object_hash(). ConnectionErrorProof only uses it as an array key for per-connection exceptions, so spl_object_id() is a drop-in replacement. added a dedicated test for the pipeline.

src/Pipeline/ConnectionErrorProof.php

@@ -101,10 +101,10 @@ class ConnectionErrorProof extends Pipeline
             $command = $commands->dequeue();
 
             $cmdConnection = $connection->getConnectionByCommand($command);
-            $connectionHash = spl_object_hash($cmdConnection);
+            $connectionId = spl_object_id($cmdConnection);
 
-            if (isset($exceptions[$connectionHash])) {
-                $responses[$i] = $exceptions[$connectionHash];
+            if (isset($exceptions[$connectionId])) {
+                $responses[$i] = $exceptions[$connectionId];
                 continue;
             }
 
@@ -112,7 +112,7 @@ class ConnectionErrorProof extends Pipeline
                 $responses[$i] = $cmdConnection->readResponse($command);
             } catch (CommunicationException $exception) {
                 $responses[$i] = $exception;
-                $exceptions[$connectionHash] = $exception;
+                $exceptions[$connectionId] = $exception;
             }
         }