[Build] Upgraded NetAnalyzers to 7.0.1 (#24792)

* upgraded NetAnalyzers to 7.0.1

* fix spellcheck

* Microsoft.CodeAnalysis.NetAnalyzers 7.0.1

* rebase and fix

src/modules/poweraccent/PowerAccent.Core/Languages.cs

@@ -2,9 +2,7 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
 using PowerToys.PowerAccentKeyboardService;
-using Windows.Globalization;
 
 namespace PowerAccent.Core
 {
@@ -42,7 +40,7 @@ namespace PowerAccent.Core
         TK,
     }
 
-    internal class Languages
+    internal sealed class Languages
     {
         public static string[] GetDefaultLetterKey(LetterKey letter, Language lang)
         {

src/modules/poweraccent/PowerAccent.Core/Tools/CharactersUsageInfo.cs

@@ -34,6 +34,7 @@ namespace PowerAccent.Core.Tools
             return timestamp;
         }
 
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1854:Prefer the 'IDictionary.TryGetValue(TKey, out TValue)' method", Justification = "False positive: https://github.com/dotnet/roslyn-analyzers/issues/6390")]
         public void IncrementUsageFrequency(string character)
         {
             if (_characterUsageCounters.ContainsKey(character))

src/modules/poweraccent/PowerAccent.UI/Selector.xaml.cs

@@ -17,7 +17,7 @@ public partial class Selector : Window, IDisposable, INotifyPropertyChanged
 
     private Visibility _characterNameVisibility = Visibility.Visible;
 
-    private int _selectedIndex = 0;
+    private int _selectedIndex;
 
     public event PropertyChangedEventHandler PropertyChanged;