Use static lambdas

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -301,7 +301,7 @@ namespace Emby.Server.Implementations.AppBase
         {
             return _configurations.GetOrAdd(
                 key,
-                (k, configurationManager) =>
+                static (k, configurationManager) =>
                 {
                     var file = configurationManager.GetConfigurationFile(k);
 

Emby.Server.Implementations/Localization/LocalizationManager.cs

@@ -310,7 +310,7 @@ namespace Emby.Server.Implementations.Localization
 
             return _dictionaries.GetOrAdd(
                 culture,
-                (key, localizationManager) => localizationManager.GetDictionary(Prefix, key, DefaultCulture + ".json").GetAwaiter().GetResult(),
+                static (key, localizationManager) => localizationManager.GetDictionary(Prefix, key, DefaultCulture + ".json").GetAwaiter().GetResult(),
                 this);
         }
 

Emby.Server.Implementations/Serialization/MyXmlSerializer.cs

@@ -21,7 +21,7 @@ namespace Emby.Server.Implementations.Serialization
         private static XmlSerializer GetSerializer(Type type)
             => _serializers.GetOrAdd(
                 type.FullName ?? throw new ArgumentException($"Invalid type {type}."),
-                (_, t) => new XmlSerializer(t),
+                static (_, t) => new XmlSerializer(t),
                 type);
 
         /// <summary>

MediaBrowser.Controller/Providers/DirectoryService.cs

@@ -25,7 +25,7 @@ namespace MediaBrowser.Controller.Providers
 
         public FileSystemMetadata[] GetFileSystemEntries(string path)
         {
-            return _cache.GetOrAdd(path, (p, fileSystem) => fileSystem.GetFileSystemEntries(p).ToArray(), _fileSystem);
+            return _cache.GetOrAdd(path, static (p, fileSystem) => fileSystem.GetFileSystemEntries(p).ToArray(), _fileSystem);
         }
 
         public List<FileSystemMetadata> GetFiles(string path)
@@ -69,7 +69,7 @@ namespace MediaBrowser.Controller.Providers
                 _filePathCache.TryRemove(path, out _);
             }
 
-            var filePaths = _filePathCache.GetOrAdd(path, (p, fileSystem) => fileSystem.GetFilePaths(p).ToList(), _fileSystem);
+            var filePaths = _filePathCache.GetOrAdd(path, static (p, fileSystem) => fileSystem.GetFilePaths(p).ToList(), _fileSystem);
 
             if (sort)
             {