feat: Update NuGet plugin loading

- Added a special case condition to skip files with .NET 5.0+ runtime monikers that have major versions exceeding the current runtime major version.
- Updated the declaration of TargetMonikerRegexes from IEnumerable<Regex> to Regex[] in NugetUtilities class.

src/YumeChan.Core/Services/Plugins/NugetPluginsFetcher.cs

@@ -249,19 +249,29 @@ private static void FlattenDownloadedPackageToDirectoryStructure(DirectoryInfo d
  List<FileInfo> files = new();
 
  // Sort all directories by matched moniker, then by last version, and pull all .dll files to "files" list.
- foreach (Regex regex in TargetMonikerRegexes)
+ for (int i = 0; i < TargetMonikerRegexes.Length; i++)
  {
+ Regex regex = TargetMonikerRegexes[i];
+
  foreach (DirectoryInfo dir in directories
-  .Where(d => 
-  regex.Matches(d.FullName).Count is 1 
-  || regex.Matches(d.FullName).Count is 2 
-  && string.Equals(regex.Matches(d.FullName)[1].Value, RuntimeInformation.RuntimeIdentifier, StringComparison.OrdinalIgnoreCase))
-  .OrderByDescending(d => d.Name, StringComparer.OrdinalIgnoreCase))
+ .Where(d =>
+ regex.Matches(d.FullName).Count is 1
+ || regex.Matches(d.FullName).Count is 2
+ && string.Equals(regex.Matches(d.FullName)[1].Value, RuntimeInformation.RuntimeIdentifier, StringComparison.OrdinalIgnoreCase)
+ ).OrderByDescending(d => d.Name, StringComparer.OrdinalIgnoreCase))
  {
+ // Special case for .NET 5.0+ runtime monikers, we must make sure the major version does not exceed the current runtime major version.
+ if (i is 1 && regex.Matches(dir.FullName) is [{ Value: var moniker }, ..] 
+ && int.TryParse(moniker["net".Length..moniker.IndexOf('.')], out int majorVersion) 
+ && majorVersion > Environment.Version.Major)
+ {
+ continue;
+ }
+
  files.AddRange(dir.GetFiles("*.dll", SearchOption.AllDirectories));
  }
  }
- 
+
  // Move all selected files to the target folder (if not present already).
  foreach (FileInfo file in files.AsParallel())
  {
@@ -322,7 +332,7 @@ private static void DeletePluginPackage(string pluginsDirectory, string packageN
 
 public static class NugetUtilities
 {
- public static IEnumerable<Regex> TargetMonikerRegexes { get; } = new List<Regex>
+ public static Regex[] TargetMonikerRegexes { get; } = 
  {
  // net x.x (5.0+) moniker
  new(@"(net\d+\.\d+)-(\D+)"),