Add note about filtering warning #1541

Job	Run time
Generate llhttp sources	10s
Linter	1m 3s
Test (3.8, ubuntu, false)	4m 40s
Test (3.8, windows, false)	9m 6s
Test (3.8, Y, ubuntu, false)	4m 35s
Test (3.9, ubuntu, false)	4m 57s
Test (3.9, macos, false)	6m 43s
Test (3.9, windows, false)	8m 40s
Test (3.9, Y, ubuntu, false)	4m 56s
Test (3.10, ubuntu, false)	4m 37s
Test (3.10, macos, false)	9m 12s
Test (3.10, windows, false)	9m 52s
Test (3.10, Y, ubuntu, false)	4m 22s
Test (pypy-3.9, Y, ubuntu, false)	10m 10s
Test (macos, 3.11, true, Y)	4m 29s
Test (ubuntu, 3.11, false, Y)	4m 14s
Test (windows, 3.11, true, Y)	17m 50s
Test (ubuntu, 3.12, true, Y)	5m 21s
Test (macos, 3.12, true, Y)	17m 22s
Test (windows, 3.12, true, Y)	17m 51s
check	9s
Pre-Deploy	0s
Tarball	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Deploy	0s
	2h 30m 19s

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