[3.13] gh-130132: properly free resources in `urrlib.urlopen` examples (GH-130280) (#131394)

gh-130132: properly free resources in `urrlib.urlopen` examples (GH-130280)
(cherry picked from commit 77d2fd441320ca365c34e21c475d3878f3d5d833)

Co-authored-by: Kanishk Pachauri <itskanishkp.py@gmail.com>
Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>