[issue36103] Increase shutil.COPY_BUFSIZE

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

> Also on Linux "echo 3 | sudo tee /proc/sys/vm/drop_caches" is supposed to  disable the cache.

As I said already, shutil is not used only with cold cache.

If cache is cold, disk speed will be upper bound in most cases.
But when cache is hot, or using very fast NVMe disk, syscall overhead
can be non-negligible.

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<https://bugs.python.org/issue36103>
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