fix: Ensure Valid Wix Version File

Author: hypetsch

src/GitVersionCore/VersionConverters/WixUpdater/WixVersionFileUpdater.cs

@@ -12,14 +12,12 @@ public interface IWixVersionFileUpdater : IVersionConverter<WixVersionContext>
     }
     public class WixVersionFileUpdater : IWixVersionFileUpdater
     {
-        private readonly IFileSystem fileSystem;
         private readonly ILog log;
         private string wixVersionFile;
         public const string WixVersionFileName = "GitVersion_WixVersion.wxi";
 
-        public WixVersionFileUpdater(IFileSystem fileSystem, ILog log)
+        public WixVersionFileUpdater(ILog log)
         {
-            this.fileSystem = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
             this.log = log ?? throw new ArgumentNullException(nameof(log));
         }
 
@@ -35,8 +33,7 @@ public void Execute(VersionVariables variables, WixVersionContext context)
             var root = doc.DocumentElement;
             doc.InsertBefore(xmlDecl, root);
 
-            using var fs = fileSystem.OpenWrite(wixVersionFile);
-            doc.Save(fs);
+            doc.Save(wixVersionFile);
         }
 
         private static string GetWixFormatFromVersionVariables(VersionVariables variables)