Fixes an issue reported by @bdraco with the P100 not working in the
latest branch:
`[Errno None] Can not write request body for HOST_REDACTED,
ClientOSError(None, 'Can not write request body for
URL_REDACTED'))`
Issue caused by the number of multi requests going above the default
batch of 5 and the P100 not being able to handle the second multi
request happening immediately as it closes the connection after each
query (See https://github.com/python-kasa/python-kasa/pull/690 for
similar issue). This introduces a small wait time on concurrent requests
once the device has raised a ClientOSError.
Also updates CI pypy versions to be 3.9 and 3.10 which are the currently
[supported
versions](https://www.pypy.org/posts/2024/01/pypy-v7315-release.html).
Otherwise latest cryptography doesn't ship with pypy3.8 wheels and is
unable to build on windows.
Also updates the `codecov-action` to v4 which fixed some intermittent
uploading errors.
