Bump urllib3 from 1.26.15 to 1.26.17 in /docs/.sphinx #16164

Job	Run time
licensing	4m 41s
cancel	8s
Check if image exists in registry	8s
linux (ubuntu-20.04, debug)	1h 28m 5s
linux-fpga (ubuntu-20.04, debug)	1h 30m 3s
pyflakes	5m 55s
linux (ubuntu-20.04, release)	1h 15m 45s
linux (ubuntu-20.04, codecov)	1h 32m 17s
Build SLES image	6s
Build image	10s
sles	0s
cppcheck	0s
tidy	0s
format	0s
	5h 57m 18s

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