Add test case to verify utf8 support in object key

[StaymanHou]

Follow-up PR for a previous PR #311 that's already resolved.

Add test case to verify it works now with object keys containing utf8 characters.

[fisenkodv]

Thank you for the PR. I have added this to our backlog queue.

[github-actions]

This pr has not received a response in a while. If you want to keep this issue open, please leave a comment below and auto-close will be canceled.

[github-actions]

This pr was closed because it has been inactive for 7 days since being marked as stale.

[dougtoppin]

This is still on our backlog to evaluate, and we will get to it. We appreciate your effort and submission.

[github-actions]

This pr has not received a response in a while. If you want to keep this issue open, please leave a comment below and auto-close will be canceled.

[simonkrol]

Hi @StaymanHou,

Thanks for your patience here, the change has been made internally and is set to be included in the next release. While our internal processes had us merge the code manually, once the release with this change is out, you'll see yourself included in the external contributors section towards the bottom of the readme and this PR will be closed.

Thanks for your contributions to Serverless Image Handler :)
Simon

[StaymanHou]

Awesome! Thx for reviewing and merging the PR.

[simonkrol]

Test case was included in v6.2.6, thanks for your contributions.