fix: encode localmode payload to UTF-8

[stevenmanton]

Issue #, if available:

#2165

Description of changes:

Encode the payload to UTF-8 so that http/client.py doesn't encode with its default latin-1.

Testing done:

I ran locally with the release from pip and ran into this issue. With this fix, the issue went away.

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[stevenmanton]

@ChoiByungWook would you mind taking a look at this PR to see if it fixes an issue that you commented on before? (Thanks for the tip on how to fix the issue!)

[stevenmanton]

@icywang86rui would you mind taking a look at this PR?

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[stevenmanton]

Thanks @icywang86rui ! What's the next step to merge this into master? Should I ping someone else who has that ability?