Fix Content-Length header regression for requests with None body (#11… #1650

Job	Run time
Linter	1m 15s
Generate llhttp sources	7s
Benchmark	6m 14s
Test (3.9, ubuntu, false)	4m 24s
Test (3.9, macos, false)	3m 0s
Test (3.10, windows, false)	4m 32s
Test (3.9, Y, ubuntu, false)	5m 3s
Test (3.9, windows, false)	4m 53s
Test (3.10, macos, false)	3m 1s
Test (3.10, Y, ubuntu, false)	5m 13s
Test (3.11, ubuntu, false)	3m 53s
Test (3.10, ubuntu, false)	4m 35s
Test (3.11, windows, false)	5m 45s
Test (3.11, macos, false)	3m 17s
Test (3.11, Y, ubuntu, false)	4m 59s
Test (3.12, macos, false)	2m 49s
Test (3.12, ubuntu, false)	4m 19s
Test (3.12, Y, ubuntu, false)	5m 17s
Test (3.13, ubuntu, false)	4m 21s
Test (3.13, windows, false)	5m 24s
Test (3.13, Y, ubuntu, false)	5m 16s
Test (3.12, windows, false)	5m 30s
Test (pypy-3.9, Y, ubuntu, false)	8m 37s
Test (3.13, macos, false)	2m 43s
check	2s
Tarball	0s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }} ${{ matrix.musl }}	0s
Deploy	0s
	1h 44m 29s

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