Remove workaround local methods.

C# 13 now allows lock and ref struct within the body of async methods. https://devblogs.microsoft.com/dotnet/csharp-13-explore-preview-features/#ref-and-unsafe-in-async-methods-and-iterators

Author: bgrainger

src/MySqlConnector/Core/ServerSession.cs

@@ -1646,15 +1646,12 @@ private async Task GetRealServerDetailsAsync(IOBehavior ioBehavior, Cancellation
 
 			// first (and only) row
 			payload = await ReceiveReplyAsync(ioBehavior, CancellationToken.None).ConfigureAwait(false);
-			static void ReadRow(ReadOnlySpan<byte> span, out int? connectionId, out ServerVersion? serverVersion)
-			{
-				var reader = new ByteArrayReader(span);
-				var length = reader.ReadLengthEncodedIntegerOrNull();
-				connectionId = (length != -1 && Utf8Parser.TryParse(reader.ReadByteString(length), out int id, out _)) ? id : default(int?);
-				length = reader.ReadLengthEncodedIntegerOrNull();
-				serverVersion = length != -1 ? new ServerVersion(reader.ReadByteString(length)) : default;
-			}
-			ReadRow(payload.Span, out var connectionId, out var serverVersion);
+
+			var reader = new ByteArrayReader(payload.Span);
+			var length = reader.ReadLengthEncodedIntegerOrNull();
+			var connectionId = (length != -1 && Utf8Parser.TryParse(reader.ReadByteString(length), out int id, out _)) ? id : default(int?);
+			length = reader.ReadLengthEncodedIntegerOrNull();
+			var serverVersion = length != -1 ? new ServerVersion(reader.ReadByteString(length)) : default;
 
 			// OK/EOF payload
 			payload = await ReceiveReplyAsync(ioBehavior, CancellationToken.None).ConfigureAwait(false);

src/MySqlConnector/MySqlConnection.cs

@@ -1189,20 +1189,16 @@ private async Task DoCloseAsync(bool changeState, IOBehavior ioBehavior)
 			};
 			connection.TakeSessionFrom(this);
 
-			ReplaceConnection(this, connection);
-			static void ReplaceConnection(MySqlConnection thisConnection, MySqlConnection connection)
+			// put the new, idle, connection into the list of sessions for this transaction (replacing this MySqlConnection)
+			lock (s_lock)
 			{
-				// put the new, idle, connection into the list of sessions for this transaction (replacing this MySqlConnection)
-				lock (s_lock)
+				foreach (var enlistedTransaction in s_transactionConnections[connection.m_enlistedTransaction!.Transaction])
 				{
-					foreach (var enlistedTransaction in s_transactionConnections[connection.m_enlistedTransaction!.Transaction])
+					if (enlistedTransaction.Connection == this)
 					{
-						if (enlistedTransaction.Connection == thisConnection)
-						{
-							enlistedTransaction.Connection = connection;
-							enlistedTransaction.IsIdle = true;
-							break;
-						}
+						enlistedTransaction.Connection = connection;
+						enlistedTransaction.IsIdle = true;
+						break;
 					}
 				}
 			}