Fix weighted soak test signature stripped by dotnet format

The iteration parameter was unused, so the dotnet format analyzer pass (IDE0060) removed it, causing xUnit to fail binding the [Repeat]-provided argument. Use the parameter so the test binds and runs the full workload.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Alex Peck

BitFaster.Caching.UnitTests/Lfu/ConcurrentLfuSoakTests.cs

@@ -256,8 +256,10 @@ await Threaded.Run(threads, () =>
 
         [Theory]
         [Repeat(soakIterations)]
-        public async Task WhenConcurrentWeightedGetUpdateRemoveCacheEndsInConsistentState()
+        public async Task WhenConcurrentWeightedGetUpdateRemoveCacheEndsInConsistentState(int iteration)
         {
+            this.output.WriteLine($"Weighted soak iteration {iteration}.");
+
             var cache = new ConcurrentLfuBuilder<int, string>()
                 .WithConcurrencyLevel(threads)
                 .WithCapacity(9)