Use a few new APIs

DiscordChatExporter.Core/Exporting/HtmlMessageWriter.cs

@@ -15,7 +15,7 @@ internal class HtmlMessageWriter(Stream stream, ExportContext context, string th
     private readonly TextWriter _writer = new StreamWriter(stream);
 
     private readonly HtmlMinifier _minifier = new();
-    private readonly List<Message> _messageGroup = new();
+    private readonly List<Message> _messageGroup = [];
 
     private bool CanJoinGroup(Message message)
     {

DiscordChatExporter.Core/Utils/PathEx.cs

@@ -1,6 +1,6 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.IO;
-using System.Runtime.InteropServices;
 using System.Text;
 
 namespace DiscordChatExporter.Core.Utils;
@@ -8,7 +8,7 @@ namespace DiscordChatExporter.Core.Utils;
 public static class PathEx
 {
     private static readonly HashSet<char> InvalidFileNameChars =
-        new(Path.GetInvalidFileNameChars());
+        [..Path.GetInvalidFileNameChars()];
 
     public static string EscapeFileName(string path)
     {
@@ -19,7 +19,7 @@ public static class PathEx
 
         // File names cannot end with a dot on Windows
         // https://github.com/Tyrrrz/DiscordChatExporter/issues/977
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        if (OperatingSystem.IsWindows())
         {
             while (buffer.Length > 0 && buffer[^1] == '.')
                 buffer.Remove(buffer.Length - 1, 1);