Fix potential deadlock in RedirectActivationTo by using try/finally

Agent-Logs-Url: https://github.com/securefolderfs-community/SecureFolderFS/sessions/90164be5-d7ca-4676-8ea7-7262be4f28f0

Co-authored-by: d2dyno1 <53011783+d2dyno1@users.noreply.github.com>

Author: Copilot

src/Platforms/SecureFolderFS.Uno/Program.cs

@@ -59,8 +59,14 @@ private static void RedirectActivationTo(AppInstance targetInstance, AppActivati
             var redirectSemaphore = new SemaphoreSlim(0, 1);
             Task.Run(async () =>
             {
-                await targetInstance.RedirectActivationToAsync(args);
-                redirectSemaphore.Release();
+                try
+                {
+                    await targetInstance.RedirectActivationToAsync(args);
+                }
+                finally
+                {
+                    redirectSemaphore.Release();
+                }
             });
             redirectSemaphore.Wait();
         }