Merge branch 'master' of https://github.com/snowflakedb/snowflake-con…

…nector-net into SNOW-878067-Retry-Strategy

Snowflake.Data/Core/Session/SessionPool.cs

@@ -36,7 +36,9 @@ internal SessionPool()
 
         ~SessionPool()
         {
-            ClearAllPools();
+            // Use async for the finalizer due to possible deadlock
+            // when waiting for the CloseResponse task while closing the session
+            ClearAllPoolsAsync();
         }
 
         public void Dispose()
@@ -191,6 +193,16 @@ internal void ClearAllPools()
             }
         }
 
+        internal async void ClearAllPoolsAsync()
+        {
+            s_logger.Debug("SessionPool::ClearAllPoolsAsync");
+            foreach (SFSession session in _sessionPool)
+            {
+                await session.CloseAsync(CancellationToken.None).ConfigureAwait(false);
+            }
+            _sessionPool.Clear();
+        }
+
         public void SetMaxPoolSize(int size)
         {
             _maxPoolSize = size;