MatrixHttpClient concurrency issue

[Devmios1me]

I encountered a crash in CommandListenerHostedService due to a race condition in MatrixHttpClient.SendAsync.

fail: LibMatrix.Utilities.Bot.Services.CommandListenerHostedService[0]
      Failed to sync!
      System.IndexOutOfRangeException: Index was outside the bounds of the array.
         at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
         at LibMatrix.Extensions.MatrixHttpClient.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
         at LibMatrix.Extensions.MatrixHttpClient.GetFromJsonAsync[T](String requestUri, JsonSerializerOptions options, CancellationToken cancellationToken)
         at LibMatrix.Helpers.SyncHelper.SyncAsyncInternal(Nullable`1 cancellationToken, Boolean noDelay)

Could you change
private Dictionary<HttpRequestMessage, int> _retries = []; to ConcurrentDictionary or add locking logic to prevent race conditions?

Thank you for your great job!

[TheArcaneBrony]

Woops, can't say I've ran into that one myself, thanks for reporting!

[TheArcaneBrony]

Switched to ConcurrentDictionary in 4ba55ad, published on NuGet as 1.0.0-preview.20260320-063214 - let me know if it resolves the crash! (Though, was that a breaking failure or was that just a log? If that completely killed the sync loop, I really should go fix that...)