fix: Make LeakyBucketRequest disposable and dispose its SemaphoreSlim

Author: nozzlegear

ShopifySharp/Infrastructure/Policies/LeakyBucketPolicy/LeakyBucket.cs

@@ -81,7 +81,7 @@ public async Task WaitForAvailableAsync(int requestCost, CancellationToken cance
         if (requestCost > MaximumAvailable)
             throw new ShopifyException($"Requested query cost of {requestCost} is larger than maximum available {MaximumAvailable}");
 
-        var r = new LeakyBucketRequest(requestCost, cancellationToken);
+        using var r = new LeakyBucketRequest(requestCost, cancellationToken);
 
         lock (_lock)
         {

ShopifySharp/Infrastructure/Policies/LeakyBucketPolicy/LeakyBucketRequest.cs

@@ -1,10 +1,16 @@
+using System;
 using System.Threading;
 
 namespace ShopifySharp.Infrastructure.Policies.LeakyBucketPolicy;
 
-internal sealed class LeakyBucketRequest(int cost, CancellationToken cancellationToken)
+internal sealed class LeakyBucketRequest(int cost, CancellationToken cancellationToken) : IDisposable
 {
     public readonly int Cost = cost;
     public readonly SemaphoreSlim Semaphore = new(0, 1);
     public readonly CancellationToken CancellationToken = cancellationToken;
+
+    public void Dispose()
+    {
+        Semaphore?.Dispose();
+    }
 }