refactor: Use collection expression in more places

Addresses some Resharper analysis warnings.

src/Recyclarr.Cli/Pipelines/CustomFormat/Models/CustomFormatTransactionData.cs

@@ -6,11 +6,11 @@ namespace Recyclarr.Cli.Pipelines.CustomFormat.Models;
 
 public record CustomFormatTransactionData
 {
-    public Collection<TrashIdMapping> DeletedCustomFormats { get; } = new();
-    public Collection<CustomFormatData> NewCustomFormats { get; } = new();
-    public Collection<CustomFormatData> UpdatedCustomFormats { get; } = new();
-    public Collection<ConflictingCustomFormat> ConflictingCustomFormats { get; } = new();
-    public Collection<CustomFormatData> UnchangedCustomFormats { get; } = new();
+    public Collection<TrashIdMapping> DeletedCustomFormats { get; } = [];
+    public Collection<CustomFormatData> NewCustomFormats { get; } = [];
+    public Collection<CustomFormatData> UpdatedCustomFormats { get; } = [];
+    public Collection<ConflictingCustomFormat> ConflictingCustomFormats { get; } = [];
+    public Collection<CustomFormatData> UnchangedCustomFormats { get; } = [];
 
     public int TotalCustomFormatChanges =>
         NewCustomFormats.Count + UpdatedCustomFormats.Count + DeletedCustomFormats.Count;

src/Recyclarr.Cli/Pipelines/CustomFormat/Models/ProcessedCustomFormatCache.cs

@@ -5,7 +5,7 @@ namespace Recyclarr.Cli.Pipelines.CustomFormat.Models;
 
 public class ProcessedCustomFormatCache : IPipelineCache
 {
-    private readonly List<CustomFormatData> _customFormats = new();
+    private readonly List<CustomFormatData> _customFormats = [];
 
     public void AddCustomFormats(IEnumerable<CustomFormatData> customFormats)
     {

tests/Recyclarr.TestLibrary/TestableLogger.cs

@@ -7,7 +7,7 @@ namespace Recyclarr.TestLibrary;
 public sealed class TestableLogger : ILogger
 {
     private readonly Logger _log;
-    private readonly List<string> _messages = new();
+    private readonly List<string> _messages = [];
 
     public TestableLogger()
     {