Bump urllib3 from 1.26.20 to 2.6.0 #3

Job	Run time
setup-venv (ubuntu-24.04)	24s
setup-venv (ubuntu-22.04)	24s
nox-lint	-1s
nox-tests	-1s
pyoxidizer-build-health_checks	-1s
pyoxidizer-build-gcm	-1s
nox-format	-1s
build_deb	-1s
nox-typecheck	-1s
	41s

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