Fix FileResponse fallback code #9459

Job	Run time
Generate llhttp sources	7s
Linter	1m 30s
Benchmark	5m 25s
Test (3.9, ubuntu, false)	3m 55s
Test (3.9, macos, false)	3m 36s
Test (3.9, windows, false)	4m 54s
Test (3.9, Y, ubuntu, false)	4m 10s
Test (3.10, ubuntu, false)	3m 57s
Test (3.10, macos, false)	3m 24s
Test (3.10, windows, false)	5m 12s
Test (3.10, Y, ubuntu, false)	4m 15s
Test (3.11, ubuntu, false)	4m 4s
Test (3.11, macos, false)	2m 39s
Test (3.11, windows, false)	4m 54s
Test (3.11, Y, ubuntu, false)	3m 52s
Test (3.12, ubuntu, false)	3m 57s
Test (3.12, macos, false)	3m 3s
Test (3.12, windows, false)	4m 8s
Test (3.12, Y, ubuntu, false)	4m 2s
Test (3.13, ubuntu, false)	4m 0s
Test (3.13, macos, false)	3m 3s
Test (3.13, windows, false)	5m 44s
Test (3.13, Y, ubuntu, false)	4m 12s
Test (pypy-3.9, Y, ubuntu, false)	7m 26s
check	2s
Pre-Deploy	0s
Tarball	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Deploy	0s
	1h 35m 31s

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