Increase file transfer chunk size from 4KB to 4MB #234

Job	Run time
Build server (macOS) (aarch64-apple-darwin)	1m 58s
Build server (macOS) (x86_64-apple-darwin)	48s
Tests on Python 3.8	2m 58s
Build server (aarch64-unknown-linux-gnu)	2m 6s
Tests on Python 3.9	2m 55s
Cargo checks	24s
Build server (x86_64-unknown-linux-gnu)	1m 47s
Tests on Python 3.10	2m 53s
Build server (aarch64-unknown-linux-musl)	1m 58s
Tests on Python 3.11	3m 5s
Build server (armv7-unknown-linux-musleabi)	2m 4s
Tests on Python 3.12	3m 4s
Build server (i686-unknown-linux-musl)	1m 59s
Tests on Python pypy3.9	5m 36s
Build server (x86_64-unknown-linux-musl)	1m 58s
Tests on Python pypy3.10	5m 11s
Build server (i686-pc-windows-gnu)	2m 18s
Build server (x86_64-pc-windows-gnu)	2m 28s
	45m 30s

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