Batchhandler results in an error when doing bulk updates.

[MitchKuijpers]

Issues

*This pull request fixes issue #760

Description

Concurrent dictionary to resolve the crashes.

Checklist (Uncheck if it is not completed)

• [ ] Test cases added
• [ ] Build and test with one-click build and test script passed

Additional work necessary

Hopefully It won't have more concurrency errors. The default method doesn't resolve the requests all at the same time, and I don't believe it is tested properly after this change.

[MitchKuijpers]

@microsoft-github-policy-service agree company="Nocore"

[robertmclaws]

Great catch, thanks!

[robertmclaws]

Fixed here: https://www.nuget.org/packages/Microsoft.Restier.AspNetCore/1.1.1-CI-20240706-232326

LMK if there are any issues, otherwise an RC build will go out next week.