Coroutine 'async_replace_file' is not awaited

[Wh1isper]

Description

https://github.com/jupyter-server/jupyter_server/blob/master/jupyter_server/services/contents/fileio.py#L376

I am currently reading the source code for file operations noticed that it seems to be missing await when call 'async_replace_file'

I'm not sure if this will cause problems

Reproduce

Expected behavior

Context

• Operating System and version:
• Browser and version:
• Jupyter Server version: master(1.12.0.dev0)

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[Wh1isper]

I created a pr: #595

It's better to fix it, isn't it?

:)

[blink1073]

Fixed in #595