Eliminate some interface dispatch around object pool use

src/Polly.Core/Hedging/Controller/HedgingController.cs

@@ -5,8 +5,8 @@ namespace Polly.Hedging.Utils;
 
 internal sealed class HedgingController
 {
-    private readonly IObjectPool<HedgingExecutionContext> _contextPool;
-    private readonly IObjectPool<TaskExecution> _executionPool;
+    private readonly ObjectPool<HedgingExecutionContext> _contextPool;
+    private readonly ObjectPool<TaskExecution> _executionPool;
     private int _rentedContexts;
     private int _rentedExecutions;
 

src/Polly.Core/Hedging/Controller/HedgingExecutionContext.cs

@@ -20,14 +20,14 @@ internal sealed class HedgingExecutionContext
 
     private readonly List<TaskExecution> _tasks = new();
     private readonly List<TaskExecution> _executingTasks = new();
-    private readonly IObjectPool<TaskExecution> _executionPool;
+    private readonly ObjectPool<TaskExecution> _executionPool;
     private readonly TimeProvider _timeProvider;
     private readonly int _maxAttempts;
     private readonly Action<HedgingExecutionContext> _onReset;
     private readonly ResilienceProperties _replacedProperties = new();
 
     public HedgingExecutionContext(
-        IObjectPool<TaskExecution> executionPool,
+        ObjectPool<TaskExecution> executionPool,
         TimeProvider timeProvider,
         int maxAttempts,
         Action<HedgingExecutionContext> onReset)

src/Polly.Core/Utils/ObjectPool.cs

@@ -5,7 +5,7 @@
 namespace Polly.Utils;
 
 // copied from https://raw.githubusercontent.com/dotnet/aspnetcore/53124ab8cbf152f59120982f1c74e802e7970845/src/ObjectPool/src/DefaultObjectPool.cs
-internal sealed class ObjectPool<T> : IObjectPool<T>
+internal sealed class ObjectPool<T>
     where T : class
 {
     internal static readonly int MaxCapacity = (Environment.ProcessorCount * 2) - 1; // the - 1 is to account for _fastItem