fix: FileLogger thread race

GSS2.Test/Logging/FileLogger.cs

@@ -5,6 +5,7 @@ public sealed class FileLogger : ILogger
     private readonly string _category;
     private readonly string _filePath;
     private static readonly object _lock = new();
+    private Queue<string> _linesToWrite = new Queue<string>();
 
     public FileLogger(string category, string filePath)
     {
@@ -37,9 +38,18 @@ public sealed class FileLogger : ILogger
 
         lock (_lock)
         {
-            File.AppendAllText(_filePath, line + Environment.NewLine);
+            _linesToWrite.Enqueue(line);
+            try
+            {
+                while (_linesToWrite.Count() > 0)
+                {
+                    File.AppendAllText(_filePath, _linesToWrite.Dequeue() + Environment.NewLine);
                     if (exception != null)
                         File.AppendAllText(_filePath, exception + Environment.NewLine);
                 }
             }
+            catch
+            { }
+        }
+    }
 }