Convert Packer's buf_size once (#726) #217

Job	Run time
Build wheels on macos-15-intel	7m 36s
Build wheels on ubuntu-24.04	5m 30s
Build wheels on windows-11-arm	6m 3s
Build wheels on windows-latest	11m 13s
Build wheels on macos-latest	3m 43s
Build wheels on ubuntu-24.04-riscv64	44m 40s
Build wheels on ubuntu-24.04-arm	4m 57s
combine_wheels	5s
upload_pypi	-1s
	1h 23m 46s

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